perf: Simplify __perf_event_read

cpuctx is always active, task context is always active for
current

the previous condition verifies that if its a task context its
for current, hence we can assume ctx->is_active.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212509.000272254@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/perf_event.c

@@ -1526,10 +1526,9 @@ static void __perf_event_read(void *info)
 	if (ctx->task && cpuctx->task_ctx != ctx)
 		return;
 
-	if (ctx->is_active)
 	update_context_time(ctx);
-	event->pmu->read(event);
 	update_event_times(event);
+	event->pmu->read(event);
 }
 
 static u64 perf_event_read(struct perf_event *event)