hrtimers: fix typo

Found by Thomas Gleixner.

This caused the lockups i've bisected back to the range-hrtimers tree.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index eb2cf98..2bd230b 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1396,7 +1396,7 @@
 	struct tick_device *td;
 	struct clock_event_device *dev;
 
-	if (hrtimer_hres_active())
+	if (!hrtimer_hres_active())
 		return;
 
 	local_irq_save(flags);