net/mlx5e: E-Switch, handle flow attribute with no destinations

Rules with drop action are not required to have a destination.
Currently the destination list is allocated with the maximum number of
destinations and passed to the fs_core layer along with the actual number
of destinations.

Remove redundant passing of dest pointer when count of dest is 0.
Signed-off-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20221203221337.29267-2-saeed@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -640,6 +640,11 @@ mlx5_eswitch_add_offloaded_rule(struct mlx5_eswitch *esw,
 		goto err_esw_get;
 	}
 
+	if (!i) {
+		kfree(dest);
+		dest = NULL;
+	}
+
 	if (mlx5_eswitch_termtbl_required(esw, attr, &flow_act, spec))
 		rule = mlx5_eswitch_add_termtbl_rule(esw, fdb, spec, esw_attr,
 						     &flow_act, dest, i);