net: dsa: lan9303: Fix error return code in lan9303_check_device()

Fix to return error code -ENODEV from the chip not found error handling
case instead of 0(ret have been overwritten to 0 by lan9303_read()), as
done elsewhere in this function.
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: Egil Hjelmeland <privat@egil-hjelmeland.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/lan9303-core.c

@@ -865,7 +865,7 @@ static int lan9303_check_device(struct lan9303 *chip)
 	if ((reg >> 16) != LAN9303_CHIP_ID) {
 		dev_err(chip->dev, "expecting LAN9303 chip, but found: %X\n",
 			reg >> 16);
-		return ret;
+		return -ENODEV;
 	}
 
 	/* The default state of the LAN9303 device is to forward packets between