perf, ARM: Fix sysfs bits removal build failure

Fix this linux-next build failure that Stephen reported:

 arch/arm/kernel/perf_event.c: In function 'armpmu_event_init':
 arch/arm/kernel/perf_event.c:543: error: request for member 'num_events' in something not a structure or union

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus <paulus@samba.org>
LKML-Reference: <20101014164925.4fa16b75.sfr@canb.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/arm/kernel/perf_event.c

@@ -534,7 +534,7 @@ static int armpmu_event_init(struct perf_event *event)
 	event->destroy = hw_perf_event_destroy;
 
 	if (!atomic_inc_not_zero(&active_events)) {
-		if (atomic_read(&active_events) > armpmu.num_events) {
+		if (atomic_read(&active_events) > armpmu->num_events) {
 			atomic_dec(&active_events);
 			return -ENOSPC;
 		}