media: rcar-vin: Do not try to stop stream if not running

Do not attempt to stop the streaming if the stream is not running.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/rcar-vin/rcar-dma.c

@@ -1301,6 +1301,11 @@ void rvin_stop_streaming(struct rvin_dev *vin)
 
 	spin_lock_irqsave(&vin->qlock, flags);
 
+	if (vin->state == STOPPED) {
+		spin_unlock_irqrestore(&vin->qlock, flags);
+		return;
+	}
+
 	vin->state = STOPPING;
 
 	/* Wait until only scratch buffer is used, max 3 interrupts. */