staging: octeon: use free_netdev(netdev) instead of kfree()

It is not guaranteed that free_netdev() is macro.
Freeing netdev without free_netdev() leads to net, tx leaks.
I might lead to dereferencing freed pointer.

Signed-off-by: Vasiliy Kulikov <[e-mail]>
Acked-by: David Daney <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/octeon/ethernet.c

···
 
 			if (register_netdev(dev) < 0) {
 				pr_err("Failed to register ethernet device for POW\n");
-				kfree(dev);
+				free_netdev(dev);
 			} else {
 				cvm_oct_device[CVMX_PIP_NUM_INPUT_PORTS] = dev;
 				pr_info("%s: POW send group %d, receive group %d\n",
···
 			}
 
 			if (!dev->netdev_ops) {
-				kfree(dev);
+				free_netdev(dev);
 			} else if (register_netdev(dev) < 0) {
 				pr_err("Failed to register ethernet device "
 					 "for interface %d, port %d\n",
 					 interface, priv->port);
-				kfree(dev);
+				free_netdev(dev);
 			} else {
 				cvm_oct_device[priv->port] = dev;
 				fau -=
···
 
 			cvm_oct_tx_shutdown_dev(dev);
 			unregister_netdev(dev);
-			kfree(dev);
+			free_netdev(dev);
 			cvm_oct_device[port] = NULL;
 		}
 	}