Fix a couple of places in res_agi where the agi_commands lock would not be

released, causing a deadlock.  (Reported by mvanbaak in #asterisk-dev,
discovered by bbryant's change to the lock tracking code to yell at you
if a thread exits with a lock still held)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@131072 65c4cc65-6c06-0410-ace0-fbb531ad65f3