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elfcopy: Clear errors after fetching the shstrtab index.
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Authored by markj on Jul 4 2019, 2:55 PM.

Details

Summary

Otherwise a future call to elf_errno() will return a non-zero value.
update_shdr(), for example, treats any errors associated with the ELF
descriptor as fatal. Clear the error per the first example in
elf_errmsg.3.

Convert to elf_getshdrstrndx() while here since elf_getshstrndx() is
apparently deprecated.

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Build 23878: arc lint + arc unit