net/mlx5e: TC, Fix error handling memory leak

Free the offload sample action on error.

Fixes: f94d6389f6 ("net/mlx5e: TC, Add support to offload sample action")
Signed-off-by: Chris Mi <cmi@nvidia.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/esw/sample.c

@@ -501,6 +501,7 @@ err_sampler:
 err_offload_rule:
 	mlx5_esw_vporttbl_put(esw, &per_vport_tbl_attr);
 err_default_tbl:
+	kfree(sample_flow);
 	return ERR_PTR(err);
 }