staging: sync: Use proper barriers when waiting indefinitely

The previous fix only addressed waiting with a timeout.

Cc: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Cc: Erik Gilling <konkers@android.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rob Clark <robclark@gmail.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: dri-devel@lists.freedesktop.org
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: NErik Gilling <konkers@android.com>
Signed-off-by: NJohn Stultz <john.stultz@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/sync.c

@@ -588,7 +588,8 @@ int sync_fence_wait(struct sync_fence *fence, long timeout)
 						       sync_fence_check(fence),
 						       timeout);
 	} else if (timeout < 0) {
-		err = wait_event_interruptible(fence->wq, fence->status != 0);
+		err = wait_event_interruptible(fence->wq,
+					       sync_fence_check(fence));
 	}
 
 	if (err < 0)