Let's make sure we hold the mutex lock before we go looking at values in the...

 Let's make sure we hold the mutex lock before we go looking at values in the queue structure that could potentially be changing while we're running.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@46372 65c4cc65-6c06-0410-ace0-fbb531ad65f3