Made ast_queue_hangup() and ast_queue_hangup_with_cause() lock instead of trylock.

It made no sense to trylock the channel and then unconditionally lock the
channel right after.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@367227 65c4cc65-6c06-0410-ace0-fbb531ad65f3