[media] vivid: improve subscribe event handling

We already check for the V4L2_EVENT_CTRL inside
v4l2_ctrl_subscribe_event() so just move this fuction to the default:
branch of the switch and let it does the job for us.
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/vivid/vivid-vid-out.c

@@ -1172,14 +1172,12 @@ int vidioc_subscribe_event(struct v4l2_fh *fh,
 			const struct v4l2_event_subscription *sub)
 {
 	switch (sub->type) {
-	case V4L2_EVENT_CTRL:
-		return v4l2_ctrl_subscribe_event(fh, sub);
 	case V4L2_EVENT_SOURCE_CHANGE:
 		if (fh->vdev->vfl_dir == VFL_DIR_RX)
 			return v4l2_src_change_event_subscribe(fh, sub);
 		break;
 	default:
-		break;
+		return v4l2_ctrl_subscribe_event(fh, sub);
 	}
 	return -EINVAL;
 }