Fix memory leak in app_queue when a device state is changed but it isn't

a member of any queue.

(closes issue #13073)
Reported by: eliel
Patches:
      app_queue.c.patch uploaded by eliel (license 64)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@131015 65c4cc65-6c06-0410-ace0-fbb531ad65f3