Clang16 will not allow implicit pointer to integer 
conversions by default. (-Werror=int-conversion by default)
This patch fixes the pointer to integer conversion.

Bug: https://bugs.gentoo.org/879035
Patch is upstreamed here: https://answers.launchpad.net/notify-osd/+question/704024

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>
--- a/src/bubble-window.c
+++ b/src/bubble-window.c
@@ -78,8 +78,8 @@ bubble_window_get_accessible (GtkWidget *widget)
     {
       AtkObjectFactory *factory = NULL;
       AtkRegistry *registry = NULL;
-      GType derived_type = NULL;
-      GType derived_atk_type = NULL;
+      GType derived_type = 0;
+      GType derived_atk_type = 0;
 
       /*
        * Figure out whether accessibility is enabled by looking at the
-- 
2.38.1