net: fix a leak in register_netdevice()

We have to free "dev->name_node" on this error path.

Fixes: ff927412 ("net: introduce name_node struct to be used in hashlist")
Reported-by: syzbot+6e13e65ffbaa33757bcb@syzkaller.appspotmail.com
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -9246,7 +9246,7 @@ int register_netdevice(struct net_device *dev)
 		if (ret) {
 			if (ret > 0)
 				ret = -EIO;
-			goto out;
+			goto err_free_name;
 		}
 	}
 
@@ -9361,12 +9361,12 @@ int register_netdevice(struct net_device *dev)
 	return ret;
 
 err_uninit:
-	if (dev->name_node)
-		netdev_name_node_free(dev->name_node);
 	if (dev->netdev_ops->ndo_uninit)
 		dev->netdev_ops->ndo_uninit(dev);
 	if (dev->priv_destructor)
 		dev->priv_destructor(dev);
+err_free_name:
+	netdev_name_node_free(dev->name_node);
 	goto out;
 }
 EXPORT_SYMBOL(register_netdevice);