media: rcar-csi2: Fix coccinelle warning for PTR_ERR_OR_ZERO()

Use the PTR_ERR_OR_ZERO() macro instead of construct:

    if (IS_ERR(foo))
        return PTR_ERR(foo);

    return 0;

Fixes: 3ae854cafd76 ("rcar-csi2: Use standby mode instead of resetting")

Reported-by: kbuild test robot <[email protected]>
Signed-off-by: Niklas Söderlund <[email protected]>
Reviewed-by: Ulrich Hecht <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

Author: Niklas Söderlund

drivers/media/platform/rcar-vin/rcar-csi2.c

@@ -1019,10 +1019,8 @@ static int rcsi2_probe_resources(struct rcar_csi2 *priv,
 		return ret;
 
 	priv->rstc = devm_reset_control_get(&pdev->dev, NULL);
-	if (IS_ERR(priv->rstc))
-		return PTR_ERR(priv->rstc);
 
-	return 0;
+	return PTR_ERR_OR_ZERO(priv->rstc);
 }
 
 static const struct rcar_csi2_info rcar_csi2_info_r8a7795 = {