Merged revisions 322749 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

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  r322749 | rmudgett | 2011-06-09 11:31:53 -0500 (Thu, 09 Jun 2011) | 15 lines
  
  Remove potential deadlock in call pickup race.
  
  Deadlock is possible in ast_do_pickup() when holding the target channel
  lock and trying to get the chan channel lock.  Also, holding the target
  lock when calling ast_channel_masquerade() is not a good idea because that
  routine does deadlock avoidance.
  
  * Removed the need to hold the target lock after marking the target with a
  datastore and getting the connected line data off of the target channel.
  
  * Moved can_pickup() to ast_can_pickup() in features.c.  Now all the call
  pickup methods use the same basic call pickup availability check.
  
  Review: https://reviewboard.asterisk.org/r/1234/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@322750 65c4cc65-6c06-0410-ace0-fbb531ad65f3