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[binutils-gdb] PR22166, SHT_GNU_verneed memory allocation

*** TEST RESULTS FOR COMMIT bd61e135492ecf624880e6b78e5fcde3c9716df6 ***

Author: Alan Modra <amodra@gmail.com>
Branch: master
Commit: bd61e135492ecf624880e6b78e5fcde3c9716df6

PR22166, SHT_GNU_verneed memory allocation

The sanity check covers the previous minimim size, plus that the size
is at least enough for sh_info verneed entries.

Also, since we write all verneed fields or exit with an error, there
isn't any need to zero the memory allocated for verneed entries.

	PR 22166
	* elf.c (_bfd_elf_slurp_version_tables): Test sh_info on
	SHT_GNU_verneed section for sanity.  Don't zalloc memory for
	verref.
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