net/mlx5: Remove useless kfree

After alloc fail, we do not need to kfree.
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c

@@ -1812,7 +1812,6 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 
 	ct_flow = kzalloc(sizeof(*ct_flow), GFP_KERNEL);
 	if (!ct_flow) {
-		kfree(ct_flow);
 		return ERR_PTR(-ENOMEM);
 	}