memleak in fill_txt

```
==1145654==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 4 byte(s) in 1 object(s) allocated from:
    #0 0x522be3 in realloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:164:3
    #1 0x5879d1 in fill_txt /src/sudo/plugins/sudoers/./toke_util.c:49:18
    #2 0x587eab in append /src/sudo/plugins/sudoers/./toke_util.c:87:5
    #3 0x57d0f3 in sudoerslex /src/sudo/plugins/sudoers/toke.l:204:13
    #4 0x560b54 in sudoersparse /src/sudo/plugins/sudoers/gram.c:1207:23
    #5 0x555a76 in LLVMFuzzerTestOneInput /src/fuzz_sudoers.c:92:5
    #6 0x45bbc3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #7 0x447332 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #8 0x44cfd6 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #9 0x4764e2 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #10 0x7f486a851b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: realloc--fill_txt--append
Direct leak of 2 byte(s) in 1 object(s) allocated from:
    #0 0x5228ed in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x5879e4 in fill_txt /src/sudo/plugins/sudoers/./toke_util.c:49:64
    #2 0x587eab in append /src/sudo/plugins/sudoers/./toke_util.c:87:5
    #3 0x57d0f3 in sudoerslex /src/sudo/plugins/sudoers/toke.l:204:13
    #4 0x560b54 in sudoersparse /src/sudo/plugins/sudoers/gram.c:1207:23
    #5 0x555a76 in LLVMFuzzerTestOneInput /src/fuzz_sudoers.c:92:5
    #6 0x45bbc3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #7 0x447332 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #8 0x44cfd6 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #9 0x4764e2 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #10 0x7f486a851b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

```

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