Memleaks in xmlXIncludeProcessFlags

```
==757160==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 6 byte(s) in 1 object(s) allocated from:
    #0 0x52287d in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x6bf29d in xmlStrndup /src/libxml2/xmlstring.c:45:23
    #2 0x6bf3a5 in xmlStrdup /src/libxml2/xmlstring.c:71:12
    #3 0x5dcad3 in xmlCopyDoc /src/libxml2/tree.c:4554:20
    #4 0x5db260 in xmlStaticCopyNode /src/libxml2/tree.c:4212:26
    #5 0x5dbe94 in xmlDocCopyNode /src/libxml2/tree.c:4412:11
    #6 0x6adb31 in xmlXIncludeCopyRange /src/libxml2/xinclude.c:1066:9
    #7 0x6ac83e in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1248:13
    #8 0x6ac76c in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1234:21
    #9 0x6a673a in xmlXIncludeIncludeNode /src/libxml2/xinclude.c:2228:6
    #10 0x6a48db in xmlXIncludeDoProcess /src/libxml2/xinclude.c:2480:6
    #11 0x6a422c in xmlXIncludeProcessTreeFlagsData /src/libxml2/xinclude.c:2533:11
    #12 0x6a4ab6 in xmlXIncludeProcessFlagsData /src/libxml2/xinclude.c:2562:12
    #13 0x6a4b02 in xmlXIncludeProcessFlags /src/libxml2/xinclude.c:2577:12
    #14 0x555b2d in LLVMFuzzerTestOneInput /src/libxml2/fuzz/xml.c:57:9
    #15 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #16 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #17 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #18 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #19 0x7f547b28cb26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: malloc--xmlStrndup--xmlStrdup
Direct leak of 6 byte(s) in 1 object(s) allocated from:
    #0 0x52287d in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x6bf29d in xmlStrndup /src/libxml2/xmlstring.c:45:23
    #2 0x6bf3a5 in xmlStrdup /src/libxml2/xmlstring.c:71:12
    #3 0x5dcad3 in xmlCopyDoc /src/libxml2/tree.c:4554:20
    #4 0x5db260 in xmlStaticCopyNode /src/libxml2/tree.c:4212:26
    #5 0x5dbe94 in xmlDocCopyNode /src/libxml2/tree.c:4412:11
    #6 0x6adb31 in xmlXIncludeCopyRange /src/libxml2/xinclude.c:1066:9
    #7 0x6ac83e in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1248:13
    #8 0x6ac76c in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1234:21
    #9 0x6a673a in xmlXIncludeIncludeNode /src/libxml2/xinclude.c:2228:6
    #10 0x6a48db in xmlXIncludeDoProcess /src/libxml2/xinclude.c:2480:6
    #11 0x6a422c in xmlXIncludeProcessTreeFlagsData /src/libxml2/xinclude.c:2533:11
    #12 0x6a4ab6 in xmlXIncludeProcessFlagsData /src/libxml2/xinclude.c:2562:12
    #13 0x6a4b02 in xmlXIncludeProcessFlags /src/libxml2/xinclude.c:2577:12
    #14 0x555cda in LLVMFuzzerTestOneInput /src/libxml2/fuzz/xml.c:79:9
    #15 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #16 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #17 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #18 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #19 0x7f547b28cb26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: malloc--xmlStrndup--xmlStrdup
Direct leak of 4 byte(s) in 1 object(s) allocated from:
    #0 0x52287d in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x6bf29d in xmlStrndup /src/libxml2/xmlstring.c:45:23
    #2 0x6bf3a5 in xmlStrdup /src/libxml2/xmlstring.c:71:12
    #3 0x5cfe82 in xmlNewDoc /src/libxml2/tree.c:1179:20
    #4 0x5dc9b4 in xmlCopyDoc /src/libxml2/tree.c:4547:11
    #5 0x5db260 in xmlStaticCopyNode /src/libxml2/tree.c:4212:26
    #6 0x5dbe94 in xmlDocCopyNode /src/libxml2/tree.c:4412:11
    #7 0x6adb31 in xmlXIncludeCopyRange /src/libxml2/xinclude.c:1066:9
    #8 0x6ac83e in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1248:13
    #9 0x6ac76c in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1234:21
    #10 0x6a673a in xmlXIncludeIncludeNode /src/libxml2/xinclude.c:2228:6
    #11 0x6a48db in xmlXIncludeDoProcess /src/libxml2/xinclude.c:2480:6
    #12 0x6a422c in xmlXIncludeProcessTreeFlagsData /src/libxml2/xinclude.c:2533:11
    #13 0x6a4ab6 in xmlXIncludeProcessFlagsData /src/libxml2/xinclude.c:2562:12
    #14 0x6a4b02 in xmlXIncludeProcessFlags /src/libxml2/xinclude.c:2577:12
    #15 0x555cda in LLVMFuzzerTestOneInput /src/libxml2/fuzz/xml.c:79:9
    #16 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #17 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #18 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #19 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #20 0x7f547b28cb26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: malloc--xmlStrndup--xmlStrdup
Direct leak of 4 byte(s) in 1 object(s) allocated from:
    #0 0x52287d in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x6bf29d in xmlStrndup /src/libxml2/xmlstring.c:45:23
    #2 0x6bf3a5 in xmlStrdup /src/libxml2/xmlstring.c:71:12
    #3 0x5cfe82 in xmlNewDoc /src/libxml2/tree.c:1179:20
    #4 0x5dc9b4 in xmlCopyDoc /src/libxml2/tree.c:4547:11
    #5 0x5db260 in xmlStaticCopyNode /src/libxml2/tree.c:4212:26
    #6 0x5dbe94 in xmlDocCopyNode /src/libxml2/tree.c:4412:11
    #7 0x6adb31 in xmlXIncludeCopyRange /src/libxml2/xinclude.c:1066:9
    #8 0x6ac83e in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1248:13
    #9 0x6ac76c in xmlXIncludeCopyXPointer /src/libxml2/xinclude.c:1234:21
    #10 0x6a673a in xmlXIncludeIncludeNode /src/libxml2/xinclude.c:2228:6
    #11 0x6a48db in xmlXIncludeDoProcess /src/libxml2/xinclude.c:2480:6
    #12 0x6a422c in xmlXIncludeProcessTreeFlagsData /src/libxml2/xinclude.c:2533:11
    #13 0x6a4ab6 in xmlXIncludeProcessFlagsData /src/libxml2/xinclude.c:2562:12
    #14 0x6a4b02 in xmlXIncludeProcessFlags /src/libxml2/xinclude.c:2577:12
    #15 0x555b2d in LLVMFuzzerTestOneInput /src/libxml2/fuzz/xml.c:57:9
    #16 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #17 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #18 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #19 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #20 0x7f547b28cb26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: malloc--xmlStrndup--xmlStrdup
SUMMARY: AddressSanitizer: 20 byte(s) leaked in 4 allocation(s).
```

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