Don't queue frames to channels that have no means to process them.

(closes issue #15609)
 Reported by: aragon
 Patches: 
       20091230__issue16521__1.4__chan_local_only.diff.txt uploaded by tilghman (license 14)
 Tested by: aragon
 
Review: https://reviewboard.asterisk.org/r/452/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@236981 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_local.c

@@ -212,7 +212,9 @@ static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_fra
 	}
 
 	if (other) {
-		ast_queue_frame(other, f);
+		if (other->pbx || other->_bridge) {
+			ast_queue_frame(other, f);
+		} /* else the frame won't go anywhere */
 		ast_channel_unlock(other);
 	}