[binutils-gdb] Fix buffer overrun found by Coverity

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 04fd5eed91c0a960e1706fb627912ad6350ae391 ***

Author: Gary Benson <gbenson@redhat.com>
Branch: master
Commit: 04fd5eed91c0a960e1706fb627912ad6350ae391

Fix buffer overrun found by Coverity

This commit fixes a buffer overrun found by Coverity, where
36 bytes are written into a 24 byte buffer.

gdb/ChangeLog:

	* dwarf2read.c (create_dwp_hash_table): Fix buffer overrun
	found by Coverity.