cr: Fix namespaces restore from older images

In old images we had no clue whether the root task is to be
created in new namespaces. Remember using the --namespaces
option for explicitl specification of this fact.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

image.c

@@ -36,12 +36,15 @@ int check_img_inventory(void)
 	fdinfo_per_id = he->has_fdinfo_per_id ?  he->fdinfo_per_id : false;
 
 	ret = he->img_version;
-	root_ids = xmalloc(sizeof(*root_ids));
-	if (!root_ids)
-		return -1;
 
-	memcpy(root_ids, he->root_ids, sizeof(*root_ids));
-	inventory_entry__free_unpacked(he, NULL);
+	if (he->root_ids) {
+		root_ids = xmalloc(sizeof(*root_ids));
+		if (!root_ids)
+			return -1;
+
+		memcpy(root_ids, he->root_ids, sizeof(*root_ids));
+		inventory_entry__free_unpacked(he, NULL);
+	}
 
 	if (ret != CRTOOLS_IMAGES_V1) {
 		pr_err("Not supported images version %u\n", ret);

namespaces.c

@@ -284,6 +284,11 @@ int check_ns_ids(struct pstree_item *item)
 	struct pstree_item *p = item->parent;
 
 	if (!p) {
+		if (!root_ids) {
+			current_ns_mask = opts.rst_namespaces_flags;
+			return 0;
+		}
+
 		current_ns_mask = get_clone_mask(item->ids, root_ids);
 		pr_info("Will restore in %lx namespaces\n", current_ns_mask);
 		return 0;