octeon_ep: fix error return code in octep_probe()

If register_netdev() fails , it should return error
code in octep_probe().

Fixes: 862cd659 ("octeon_ep: Add driver framework and device initialization")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/octeon_ep/octep_main.c

@@ -1071,7 +1071,8 @@ static int octep_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	octep_get_mac_addr(octep_dev, octep_dev->mac_addr);
 	eth_hw_addr_set(netdev, octep_dev->mac_addr);
 
-	if (register_netdev(netdev)) {
+	err = register_netdev(netdev);
+	if (err) {
 		dev_err(&pdev->dev, "Failed to register netdev\n");
 		goto register_dev_err;
 	}