We have a function that does exactly what we want here, use it. This
reduces the amount of cpuctx->task_ctx muckery.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/events/core.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -2545,8 +2545,7 @@ static void perf_event_context_sched_out
 
 	if (do_switch) {
 		raw_spin_lock(&ctx->lock);
-		ctx_sched_out(ctx, cpuctx, EVENT_ALL);
-		cpuctx->task_ctx = NULL;
+		task_ctx_sched_out(cpuctx, ctx);
 		raw_spin_unlock(&ctx->lock);
 	}
 }