core: object: implement rvalue object support

core/object.c

@@ -157,3 +157,9 @@ void b_object_unref(struct _b_object *p)
 
 	free(p);
 }
+
+struct _b_object *b_object_make_rvalue(struct _b_object *p)
+{
+	p->obj_ref = 0;
+	return p;
+}