Fix a stupid bug s/readfd/errfd/ affecting channel close on child exit

--HG--
extra : convert_revision : 16dd04147563e91faaa44de193dece0f4056ec7a

common-channel.c

@@ -296,7 +296,7 @@ static void check_close(struct Channel *channel) {
 			TRACE(("send data readfd"))
 			send_msg_channel_data(channel, 0);
 		}
-		if (ERRFD_IS_READ(channel) && channel->readfd >= 0 
+		if (ERRFD_IS_READ(channel) && channel->errfd >= 0 
 			&& channel->transwindow > 0) {
 			TRACE(("send data errfd"))
 			send_msg_channel_data(channel, 1);