Merged revisions 329144 via svnmerge from

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

........
  r329144 | rmudgett | 2011-07-21 11:46:21 -0500 (Thu, 21 Jul 2011) | 9 lines
  
  Dialplan bridge() app mutex 'current_dest_chan' freed more times than we've locked!
  
  This appears to be a leftover from when ast_channel was converted to ao2
  objects.
  
  Simply removed the extraneous unlock.
  
  (closes issue ASTERISK-17772)
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@329145 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/features.c

@@ -6149,8 +6149,6 @@ static int bridge_exec(struct ast_channel *chan, const char *data)
 					"Channel2: %s\r\n", chan->name, args.dest_chan);
 	}
 
-	ast_channel_unlock(current_dest_chan);
-
 	do_bridge_masquerade(current_dest_chan, final_dest_chan);
 
 	chans[0] = current_dest_chan;