net/mlx4: fix small memory leak on error

"work" needs to be freed before returning on this error path.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
index 707a7d0..299d018 100644
--- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c
@@ -1572,6 +1572,7 @@
 					   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);