Fixed use of uninitialized ao2 container iterator in an off-nominal
condition.  Either a memory allocation error or the requested channel is
an internal channel not exposed to the outside.
........

Merged revisions 408715 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@408723 65c4cc65-6c06-0410-ace0-fbb531ad65f3