net/mlx5: E-switch, Fix printing wrong error value

When mlx5_modify_header_alloc() fails, instead of printing the error
value returned, current error log prints 0.

Fix by printing correct error value returned by
mlx5_modify_header_alloc().

Fixes: 6724e66 ("net/mlx5: E-Switch, Get reg_c1 value on miss")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -1550,9 +1550,9 @@ static int esw_create_restore_table(struct mlx5_eswitch *esw)
 					   MLX5_FLOW_NAMESPACE_KERNEL, 1,
 					   modact);
 	if (IS_ERR(mod_hdr)) {
+		err = PTR_ERR(mod_hdr);
 		esw_warn(dev, "Failed to create restore mod header, err: %d\n",
 			 err);
-		err = PTR_ERR(mod_hdr);
 		goto err_mod_hdr;
 	}