Issue 56134 in oss-fuzz: elfutils:fuzz-libdwfl: Use-of-uninitialized-value in check_section

["evv… via monorail" <monorail+v2.2672886254@chromium.org>]

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Comment #1 on issue 56134 by evv...@gmail.com: elfutils:fuzz-libdwfl: Use-of-uninitialized-value in check_section
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=56134#c1

Below is the full backtrace
```
==2272==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x5fb3c7 in check_section /src/elfutils/libdw/dwarf_begin_elf.c:265:7
    #1 0x5f8d3e in global_read /src/elfutils/libdw/dwarf_begin_elf.c:444:14
    #2 0x5f8d3e in dwarf_begin_elf /src/elfutils/libdw/dwarf_begin_elf.c:595:9
    #3 0x53f28c in load_dw /src/elfutils/libdwfl/dwfl_module_getdwarf.c:1341:13
    #4 0x53c5b9 in find_dw /src/elfutils/libdwfl/dwfl_module_getdwarf.c:1391:16
    #5 0x53c5b9 in dwfl_module_getdwarf /src/elfutils/libdwfl/dwfl_module_getdwarf.c:1446:3
    #6 0x534b72 in LLVMFuzzerTestOneInput /src/fuzz-libdwfl.c:54:3
    #7 0x43dcf3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
    #8 0x429452 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
    #9 0x42ecfc in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9
    #10 0x458232 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #11 0x7fe0978dd0b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
    #12 0x41f61d in _start
  Uninitialized value was created by a heap allocation
    #0 0x4e2310 in __interceptor_malloc /src/llvm-project/compiler-rt/lib/msan/msan_interceptors.cpp:895:3
    #1 0x6b9935 in convert_data /src/elfutils/libelf/elf_getdata.c:166:24
    #2 0x6b9935 in __libelf_set_data_list_rdlock /src/elfutils/libelf/elf_getdata.c:455:7
    #3 0x6ba571 in __elf_getdata_rdlock /src/elfutils/libelf/elf_getdata.c:562:5
    #4 0x6ba6cd in elf_getdata /src/elfutils/libelf/elf_getdata.c:580:12
    #5 0x5faec7 in check_section /src/elfutils/libdw/dwarf_begin_elf.c:246:20
    #6 0x5f8d3e in global_read /src/elfutils/libdw/dwarf_begin_elf.c:444:14
    #7 0x5f8d3e in dwarf_begin_elf /src/elfutils/libdw/dwarf_begin_elf.c:595:9
    #8 0x53f28c in load_dw /src/elfutils/libdwfl/dwfl_module_getdwarf.c:1341:13
    #9 0x53c5b9 in find_dw /src/elfutils/libdwfl/dwfl_module_getdwarf.c:1391:16
    #10 0x53c5b9 in dwfl_module_getdwarf /src/elfutils/libdwfl/dwfl_module_getdwarf.c:1446:3
    #11 0x534b72 in LLVMFuzzerTestOneInput /src/fuzz-libdwfl.c:54:3
    #12 0x43dcf3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15
    #13 0x429452 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
    #14 0x42ecfc in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9
    #15 0x458232 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #16 0x7fe0978dd0b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
SUMMARY: MemorySanitizer: use-of-uninitialized-value (/mnt/scratch0/clusterfuzz/bot/builds/clusterfuzz-builds_elfutils_3ee01cb67db1a71e7adeb7f3f14722ea62f13cd5/revisions/fuzz-libdwfl+0x5fb3c7)
```

Looks like it was introduced in https://sourceware.org/git/?p=elfutils.git;a=commitdiff;h=fda09f5f188fb173b2123815be71ca4647a8adfb

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