validate: use MAY_BE_LEAKED flag

Reviewed-by: Thibault Saunier <tsaunier@gnome.org>
Differential Revision: https://phabricator.freedesktop.org/D1230

validate/gst/validate/gst-validate-scenario.c

@@ -333,6 +333,8 @@ gst_validate_action_type_new (void)
 
   gst_validate_action_type_init (type);
 
+  /* action types are never freed */
+  GST_MINI_OBJECT_FLAG_SET (type, GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
   return type;
 }