stack overflow in htmlDocContentDumpOutput

```
#0  0x000000000052206e in __asan_memmove () at /src/llvm-project/compiler-rt/lib/asan/asan_interceptors_memintrinsics.cpp:30
#1  0x00000000006bf9e0 in xmlBufAdd () at buf.c:908
#2  0x00000000005fd402 in xmlOutputBufferWrite () at xmlIO.c:3382
#3  0x00000000005fef64 in xmlOutputBufferWriteString () at xmlIO.c:3656
#4  0x000000000065406d in htmlNodeDumpFormatOutput () at HTMLtree.c:901
#5  0x0000000000655e14 in htmlNodeListDumpOutput () at HTMLtree.c:801
#6  0x00000000006549ab in htmlNodeDumpFormatOutput () at HTMLtree.c:968
#7  0x0000000000655e14 in htmlNodeListDumpOutput () at HTMLtree.c:801
#8  0x00000000006549ab in htmlNodeDumpFormatOutput () at HTMLtree.c:968
#9  0x0000000000655e14 in htmlNodeListDumpOutput () at HTMLtree.c:801
(More stack frames follow...)
#80599 0x0000000000655e14 in htmlNodeListDumpOutput () at HTMLtree.c:801
#80600 0x00000000006549ab in htmlNodeDumpFormatOutput () at HTMLtree.c:968
#80601 0x0000000000655e14 in htmlNodeListDumpOutput () at HTMLtree.c:801
#80602 0x0000000000655492 in htmlDocContentDumpFormatOutput () at HTMLtree.c:1039
#80603 0x0000000000655566 in htmlDocContentDumpOutput () at HTMLtree.c:1056
#80604 0x0000000000555a8c in LLVMFuzzerTestOneInput () at html.c:53
#80605 0x000000000045bb54 in ExecuteCallback () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599
#80606 0x00000000004472c3 in RunOneTest () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323
#80607 0x000000000044cf67 in FuzzerDriver () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856
#80608 0x0000000000476473 in main () at /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20
```

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