Merged revisions 306672 via svnmerge from

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

........
  r306672 | twilson | 2011-02-07 14:35:20 -0800 (Mon, 07 Feb 2011) | 10 lines
  
  Don't try to pickup a call in the middle of a masquerade
  
  If A calls B which doesn't answer and C & D both try to do a call pickup, it is
  possible for ast_pickup_call to answer the call, then fail to masquerade one of
  the calls because the other one is already in the process of masquerading. This
  patch checks to see if the channel is in the process of masquerading before
  call before selecting it for a pickup.
  
  Review: https://reviewboard.asterisk.org/r/1094/
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@306673 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/features.c

@@ -4882,7 +4882,8 @@ static int find_channel_by_group(struct ast_channel *c, void *data) {
 		   change while we're here, but that isn't a problem. */
 		(c != chan) &&
 		(chan->pickupgroup & c->callgroup) &&
-		((c->_state == AST_STATE_RINGING) || (c->_state == AST_STATE_RING));
+		((c->_state == AST_STATE_RINGING) || (c->_state == AST_STATE_RING)) &&
+		!c->masq;
 }
 
 /*!