Merged revisions 317574 via svnmerge from

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

........
  r317574 | twilson | 2011-05-06 00:55:21 -0700 (Fri, 06 May 2011) | 6 lines
  
  Re-fix queue round-robin
  
  This part of the change for r315596 was incorrect. No bridge occurs
  when doing a roundrobin dial and no one answers, so this code shouldn't
  have been removed.
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@317575 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_queue.c

@@ -3843,6 +3843,17 @@ static int try_calling(struct queue_ent *qe, const char *options, char *announce
 	if (need_weight)
 		ao2_unlock(queues);
 	lpeer = wait_for_answer(qe, outgoing, &to, &digit, numbusies, ast_test_flag(&(bridge_config.features_caller), AST_FEATURE_DISCONNECT), forwardsallowed);
+	/* The ast_channel_datastore_remove() function could fail here if the
+	 * datastore was moved to another channel during a masquerade. If this is
+	 * the case, don't free the datastore here because later, when the channel
+	 * to which the datastore was moved hangs up, it will attempt to free this
+	 * datastore again, causing a crash
+	 */
+	ast_channel_lock(qe->chan);
+	if (datastore && !ast_channel_datastore_remove(qe->chan, datastore)) {
+		ast_datastore_free(datastore);
+	}
+	ast_channel_unlock(qe->chan);
 	ao2_lock(qe->parent);
 	if (qe->parent->strategy == QUEUE_STRATEGY_RRMEMORY || qe->parent->strategy == QUEUE_STRATEGY_RRORDERED) {
 		store_next_rr(qe, outgoing);