memleak in process_mips_specific

```
==1478732==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 480 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 0x66909c in xmalloc /src/binutils-gdb/libiberty/./xmalloc.c:147:12
    #2 0x5bf169 in cmalloc /src/binutils-gdb/binutils/dwarf.c:10230:10
    #3 0x5b16b5 in process_mips_specific /src/binutils-gdb/binutils/./readelf.h:16697:15
    #4 0x57a391 in process_arch_specific /src/binutils-gdb/binutils/./readelf.h:19719:14
    #5 0x56522e in process_object /src/binutils-gdb/binutils/./readelf.h:20042:9
    #6 0x558bdd in process_file /src/binutils-gdb/binutils/./readelf.h:20480:13
    #7 0x558fc2 in LLVMFuzzerTestOneInput /src/binutils-gdb/binutils/fuzz_readelf.c:53:2
    #8 0x45bb53 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #9 0x4472c2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #10 0x44cf66 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #11 0x476472 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #12 0x7fac181f8b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: malloc--xmalloc--cmalloc
Direct leak of 248 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 0x556106 in get_data /src/binutils-gdb/binutils/./readelf.h:439:14
    #2 0x5b167e in process_mips_specific /src/binutils-gdb/binutils/./readelf.h:16688:39
    #3 0x57a391 in process_arch_specific /src/binutils-gdb/binutils/./readelf.h:19719:14
    #4 0x56522e in process_object /src/binutils-gdb/binutils/./readelf.h:20042:9
    #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 0x7fac181f8b26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

DEDUP_TOKEN: malloc--get_data--process_mips_specific
SUMMARY: AddressSanitizer: 728 byte(s) leaked in 2 allocation(s).

```

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