sched: hrtick_enabled() should use cpu_active()

Peter pointed out that hrtick_enabled() should use cpu_active().

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched.c b/kernel/sched.c
index 85cf246..62b1b8e 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1006,7 +1006,7 @@
 {
 	if (!sched_feat(HRTICK))
 		return 0;
-	if (!cpu_online(cpu_of(rq)))
+	if (!cpu_active(cpu_of(rq)))
 		return 0;
 	return hrtimer_is_hres_active(&rq->hrtick_timer);
 }