res_pjsip_authenticator_digest: Fix md5 hash buffer
An md5 hash is 32 bytes long. The char buffer must be at least 33 bytes to
avoid clobbering of the stack. This patch also fixes a potential clobbering
in test_utils.c.
Thanks to Andrew Nagy for reporting and testing this out in #asterisk-dev
Reported by: Andrew Nagy
Tested by: Andrew Nagy
........
Merged revisions 404843 from http://svn.asterisk.org/svn/asterisk/branches/12
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@404844
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