net/mlx4: fix small memory leak on error

"work" needs to be freed before returning on this error path.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/cmd.c

@@ -1572,6 +1572,7 @@ int mlx4_master_immediate_activate_vlan_qos(struct mlx4_priv *priv,
 					   vp_admin->default_vlan,
 					   &admin_vlan_ix);
 		if (err) {
+			kfree(work);
 			mlx4_warn((&priv->dev),
 				  "No vlan resources slave %d, port %d\n",
 				  slave, port);