net/mlx5e: Fix error code in mlx5e_tc_action_miss_mapping_get()

Preserve the error code if esw_add_restore_rule() fails.  Don't return
success.

Fixes: 67027828 ("net/mlx5e: TC, Set CT miss to the specific ct action instance")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -5736,8 +5736,10 @@ int mlx5e_tc_action_miss_mapping_get(struct mlx5e_priv *priv, struct mlx5_flow_a
 
 	esw = priv->mdev->priv.eswitch;
 	attr->act_id_restore_rule = esw_add_restore_rule(esw, *act_miss_mapping);
-	if (IS_ERR(attr->act_id_restore_rule))
+	if (IS_ERR(attr->act_id_restore_rule)) {
+		err = PTR_ERR(attr->act_id_restore_rule);
 		goto err_rule;
+	}
 
 	return 0;