mlxsw: spectrum: Fix error path in mlxsw_sp_module_init

Add forgotten notifier unregister.

Fixes: 99724c18 ("mlxsw: spectrum: Introduce support for router interfaces")
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -4553,6 +4553,7 @@ static int __init mlxsw_sp_module_init(void)
 	return 0;
 
 err_core_driver_register:
+	unregister_inetaddr_notifier(&mlxsw_sp_inetaddr_nb);
 	unregister_netdevice_notifier(&mlxsw_sp_netdevice_nb);
 	return err;
 }