Fix some memory leaks.

These memory leaks were found and fixed by John Hardin. I'm just
committing them for him.

ASTERISK-24736 #close
Reported by Mark Michelson

Review: https://reviewboard.asterisk.org/r/4389
........

Merged revisions 431468 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@431469 65c4cc65-6c06-0410-ace0-fbb531ad65f3