on the channel (such as if you set a call limit based on the system's load
average), then there were cases where a channel that has already been free'd
using ast_hangup() got accessed. This caused weird memory corruption and
crashes to occur.
(fixes issue BE-386)
(much debugging credit goes to twilson, final patch written by me)
git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@107158 65c4cc65-6c06-0410-ace0-fbb531ad65f3