clocksource: Use cpumask_next_wrap() in clocksource_watchdog()

cpumask_next_wrap() is more verbose and efficient comparing to
cpumask_next() followed by cpumask_first().

Signed-off-by: Yury Norov [NVIDIA] <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: John Stultz <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

Author: YuryNorov

kernel/time/clocksource.c

@@ -587,9 +587,7 @@ static void clocksource_watchdog(struct timer_list *unused)
 	 * Cycle through CPUs to check if the CPUs stay synchronized
 	 * to each other.
 	 */
-	next_cpu = cpumask_next(raw_smp_processor_id(), cpu_online_mask);
-	if (next_cpu >= nr_cpu_ids)
-		next_cpu = cpumask_first(cpu_online_mask);
+	next_cpu = cpumask_next_wrap(raw_smp_processor_id(), cpu_online_mask);
 
 	/*
 	 * Arm timer if not already pending: could race with concurrent