When doing some tests, I was having a crash at the end of every call

if an attended transfer occurred during the call. I traced the cause to
the CDR on one of the channels being NULL. murf suggested a check in
the end bridge callback to be sure the CDR is non-NULL before proceeding,
so that's what I'm adding.



git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@156167 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -838,6 +838,10 @@ static void end_bridge_callback (void *data)
 	time_t end;
 	struct ast_channel *chan = data;
 
+	if (!chan->cdr) {
+		return;
+	}
+
 	time(&end);
 
 	ast_channel_lock(chan);