[media] rcar-vin: return correct error from platform_get_irq()

Fix a error from the original driver where the wrong error code is
returned if the driver fails to get a IRQ number from
platform_get_irq().

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

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

@@ -282,8 +282,8 @@ static int rcar_vin_probe(struct platform_device *pdev)
 		return PTR_ERR(vin->base);
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
-		return ret;
+	if (irq < 0)
+		return irq;
 
 	ret = rvin_dma_probe(vin, irq);
 	if (ret)