[glade] GladeWidget: add support for g_autoptr

[Juan Pablo Ugarte <jpu src gnome org>]

commit 032124d2149b79ce94c8f01869dffa11395f68b7
Author: Juan Pablo Ugarte <juanpablougarte gmail com>
Date:   Fri Aug 7 11:50:10 2020 -0300

    GladeWidget: add support for g_autoptr

 gladeui/glade-widget.h | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gladeui/glade-widget.h b/gladeui/glade-widget.h
index 7892ad9d5..d1a2d3767 100644
--- a/gladeui/glade-widget.h
+++ b/gladeui/glade-widget.h
@@ -21,6 +21,8 @@ G_BEGIN_DECLS
 typedef struct _GladeWidgetClass   GladeWidgetClass;
 typedef struct _GladeWidgetPrivate GladeWidgetPrivate;
 
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GladeWidget, g_object_unref)
+
 struct _GladeWidget
 {
   GInitiallyUnowned parent_instance;