ktime: Cleanup ktime_set() usage

ktime_set(S,N) was required for the timespec storage type and is still
useful for situations where a Seconds and Nanoseconds part of a time value
needs to be converted. For anything where the Seconds argument is 0, this
is pointless and can be replaced with a simple assignment.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>

net/sched/sch_cbq.c

@@ -509,7 +509,7 @@ static enum hrtimer_restart cbq_undelay(struct hrtimer *timer)
 	if (delay) {
 		ktime_t time;
 
-		time = ktime_set(0, 0);
+		time = 0;
 		time = ktime_add_ns(time, PSCHED_TICKS2NS(now + delay));
 		hrtimer_start(&q->delay_timer, time, HRTIMER_MODE_ABS_PINNED);
 	}