Merged revisions 67716 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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r67716 | russell | 2007-06-06 11:55:59 -0500 (Wed, 06 Jun 2007) | 13 lines

Merged revisions 67715 via svnmerge from 
https://origsvn.digium.com/svn/asterisk/branches/1.2

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r67715 | russell | 2007-06-06 11:40:51 -0500 (Wed, 06 Jun 2007) | 5 lines

We have some bug reports showing crashes due to a double free of a channel.
Add a sanity check to ast_channel_free() to make sure we don't go on trying
to free a channel that wasn't found in the channel list.
(issue #8850, and others...)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@67717 65c4cc65-6c06-0410-ace0-fbb531ad65f3