RDS: Bypass workqueue when queueing cong updates

Now that rds_send_xmit() does not block, we can call it directly
instead of going through the helper thread.
Signed-off-by: Andy Grover <andy.grover@oracle.com>

net/rds/cong.c

@@ -221,7 +221,7 @@ void rds_cong_queue_updates(struct rds_cong_map *map)
 	list_for_each_entry(conn, &map->m_conn_list, c_map_item) {
 		if (!test_and_set_bit(0, &conn->c_map_queued)) {
 			rds_stats_inc(s_cong_update_queued);
-			queue_delayed_work(rds_wq, &conn->c_send_w, 0);
+			rds_send_xmit(conn);
 		}
 	}