bonding: vlans don't get deleted on enslave failure

The main problem is with vid refcount which only gets bumped up.
Delete the vlans after err_detach as that's the first error path
after the vlans are added.
Signed-off-by: NNikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_main.c

@@ -1906,6 +1906,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev)
 		bond_mc_list_flush(bond_dev, slave_dev);
 		netif_addr_unlock_bh(bond_dev);
 	}
+	bond_del_vlans_from_slave(bond, slave_dev);
 	write_lock_bh(&bond->lock);
 	bond_detach_slave(bond, new_slave);
 	write_unlock_bh(&bond->lock);