ar71xx: ag71xx: fix mii_bus_dev sanity check

The mii_bus device is not required if phy_mask is zero.
The driver will use a fixed connection if it is not
specified.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 34849

target/linux/ar71xx/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c

@@ -1071,7 +1071,7 @@ static int __devinit ag71xx_probe(struct platform_device *pdev)
 		goto err_out;
 	}
 
-	if (pdata->mii_bus_dev == NULL) {
+	if (pdata->mii_bus_dev == NULL && pdata->phy_mask) {
 		dev_err(&pdev->dev, "no MII bus device specified\n");
 		err = -EINVAL;
 		goto err_out;