Merged revisions 246545 via svnmerge from

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

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  r246545 | dvossel | 2010-02-12 17:30:17 -0600 (Fri, 12 Feb 2010) | 16 lines
  
  lock channel during datastore removal
  
  On channel destruction the channel's datastores are removed and
  destroyed.  Since there are public API calls to find and remove
  datastores on a channel, a lock should be held whenever datastores are
  removed and destroyed.  This resolves a crash caused by a race
  condition in app_chanspy.c.
  
  (closes issue #16678)
  Reported by: tim_ringenbach
  Patches:
        datastore_destroy_race.diff uploaded by tim ringenbach (license 540)
  Tested by: dvossel
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@246546 65c4cc65-6c06-0410-ace0-fbb531ad65f3