[gtk] gl area: Use standard padding

[Matthias Clasen <matthiasc src gnome org>]

commit 86f81a11d82655716acb0f14490f8af50751e92c
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun May 26 22:18:30 2019 -0400

    gl area: Use standard padding

 gtk/gtkglarea.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkglarea.h b/gtk/gtkglarea.h
index 9919221a16..68c1dc6688 100644
--- a/gtk/gtkglarea.h
+++ b/gtk/gtkglarea.h
@@ -72,7 +72,7 @@ struct _GtkGLAreaClass
   GdkGLContext * (* create_context) (GtkGLArea        *area);
 
   /*< private >*/
-  gpointer _padding[6];
+  gpointer _padding[8];
 };
 
 GDK_AVAILABLE_IN_ALL