memleak in xmlSchemaParse

```
==8==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 19 byte(s) in 1 object(s) allocated from:
    #0 0x521b8d in malloc /src/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0x87751c in xmlStrndup /src/libxml2/xmlstring.c:45:23
    #2 0x9d51f7 in xmlSchemaCollapseString /src/libxml2/xmlschemastypes.c:1985:9
    #3 0x9d6292 in xmlSchemaValAtomicType /src/libxml2/xmlschemastypes.c:2174:10
    #4 0x9d5ad3 in xmlSchemaValPredefTypeNode /src/libxml2/xmlschemastypes.c:3371:12
    #5 0x911a9f in xmlSchemaPValAttrNodeValue /src/libxml2/xmlschemas.c:6314:12
    #6 0x90e1a1 in xmlSchemaPValAttrNode /src/libxml2/xmlschemas.c:6375:13
    #7 0x9132c1 in xmlSchemaParseAnnotation /src/libxml2/xmlschemas.c:6626:3
    #8 0x90bcca in xmlSchemaParseSchemaTopLevel /src/libxml2/xmlschemas.c:9787:14
    #9 0x8e59aa in xmlSchemaParseNewDocWithContext /src/libxml2/xmlschemas.c:10165:11
    #10 0x8e1ee0 in xmlSchemaParse /src/libxml2/xmlschemas.c:21377:9
    #11 0x553ff0 in LLVMFuzzerTestOneInput /src/libxml2/fuzz/schema.c:29:19
    #12 0x45a361 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm/projects/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:556:15
    #13 0x444f81 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm/projects/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:292:6
    #14 0x44ac3e in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm/projects/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:774:9
    #15 0x474db2 in main /src/llvm/projects/compiler-rt/lib/fuzzer/FuzzerMain.cpp:19:10
    #16 0x7f57173c482f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)

SUMMARY: AddressSanitizer: 19 byte(s) leaked in 1 allocation(s).
```

src-openEuler/libxml2

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