Merged revisions 64868 via svnmerge from

Merged revisions 64868 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r64868 | russell | 2007-05-17 21:48:51 -0500 (Thu, 17 May 2007) | 5 lines

Fix a small bug I noticed while working on something else.  app_queue did not
unregister its device state monitoring callback in unload_module().  So, this
would make Asterisk crash on the first device state change after you
unload the module.

........

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@64869 65c4cc65-6c06-0410-ace0-fbb531ad65f3