deadline: Allow 0ms deadline latency, increase the read speed

Change a timer compare from after to after-equals, thus allowing
0 timeout and making deadline schedule FIFO.
Signed-off-by: Nxiaobing tu <xiaobing.tu@intel.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/deadline-iosched.c

@@ -230,7 +230,7 @@ static inline int deadline_check_fifo(struct deadline_data *dd, int ddir)
 	/*
 	 * rq is expired!
 	 */
-	if (time_after(jiffies, rq_fifo_time(rq)))
+	if (time_after_eq(jiffies, rq_fifo_time(rq)))
 		return 1;
 
 	return 0;