Revert "atm: Do not free already unregistered net device."

This reverts commit 65e4113684e50cee75357ce10dc9026b0929e4e9.

Unlike the other cases Pavel fixed, this case did not
setup a netdev->destructor of free_netdev, therefore this
change was not correct.

Signed-off-by: David S. Miller <[e-mail]>

net/atm/br2684.c

···
 			list_del(&brdev->br2684_devs);
 			write_unlock_irq(&devs_lock);
 			unregister_netdev(net_dev);
+			free_netdev(net_dev);
 		}
 		return;
 	}
···
 
 		list_del(&brdev->br2684_devs);
 		unregister_netdev(net_dev);
+		free_netdev(net_dev);
 	}
 }