net: r6040: Return proper error for r6040_init_one

Return -ENOMEM instead of 0 for the case of mdiobus_alloc and kmalloc failure.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/r6040.c

@@ -1153,6 +1153,7 @@ static int __devinit r6040_init_one(struct pci_dev *pdev,
 	lp->mii_bus = mdiobus_alloc();
 	if (!lp->mii_bus) {
 		dev_err(&pdev->dev, "mdiobus_alloc() failed\n");
+		err = -ENOMEM;
 		goto err_out_unmap;
 	}
 
@@ -1165,6 +1166,7 @@ static int __devinit r6040_init_one(struct pci_dev *pdev,
 	lp->mii_bus->irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
 	if (!lp->mii_bus->irq) {
 		dev_err(&pdev->dev, "mii_bus irq allocation failed\n");
+		err = -ENOMEM;
 		goto err_out_mdio;
 	}