memleak in parse_gnu_debugaltlink

```
==1347034==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 16 byte(s) in 1 object(s) allocated from:
    #0 0x522a12 in calloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:154:3
    #1 0x5c39af in parse_gnu_debugaltlink /src/binutils-gdb/binutils/dwarf.c:10457:19
    #2 0x5c3287 in load_separate_debug_info /src/binutils-gdb/binutils/dwarf.c:10564:28
    #3 0x5bf8a4 in load_separate_debug_files /src/binutils-gdb/binutils/dwarf.c:10856:7
    #4 0x56508e in process_object /src/binutils-gdb/binutils/./readelf.h:20014:27
    #5 0x558bdd in process_file /src/binutils-gdb/binutils/./readelf.h:20480:13
    #6 0x558fc2 in LLVMFuzzerTestOneInput /src/binutils-gdb/binutils/fuzz_readelf.c:53:2
    #7 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #8 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #9 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #10 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #11 0x7f01adbc7b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: calloc--parse_gnu_debugaltlink--load_separate_debug_info
SUMMARY: AddressSanitizer: 16 byte(s) leaked in 1 allocation(s).

```

src-openEuler/binutils

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