[gtk/gtk-3-24: 1/3] gdk/wayland: Fix gdk_window_impl_wayland_finalize() warnings

[Matthias Clasen <matthiasc src gnome org>]

commit c9601f1567177f1552bcc25d279e2340deee01e1
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Thu Jan 23 14:14:39 2020 +0100

    gdk/wayland: Fix gdk_window_impl_wayland_finalize() warnings
    
    On Wayland, opening and closing a `GdkDisplay` generates a coupe of
    warnings at runtime:
    
    ```
      GLib-GObject-WARNING **:
        invalid cast from 'GdkWindowImplWayland' to 'GdkWindow'
      GLib-GObject-WARNING **:
        invalid cast from 'GdkWaylandWindow' to 'GdkWindowImplWayland'
    ```
    
    This is from `gdk_window_impl_wayland_finalize()` which tries to cast
    the given GObject to a `GdkWindow` while it's a `GdkWindowImplWayland`.
    
    Use the correct type casting of objects to avoid the warnings.

 gdk/wayland/gdkwindow-wayland.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/gdk/wayland/gdkwindow-wayland.c b/gdk/wayland/gdkwindow-wayland.c
index b5d427ce31..c699025027 100644
--- a/gdk/wayland/gdkwindow-wayland.c
+++ b/gdk/wayland/gdkwindow-wayland.c
@@ -992,15 +992,14 @@ gdk_window_impl_wayland_beep (GdkWindow *window)
 static void
 gdk_window_impl_wayland_finalize (GObject *object)
 {
-  GdkWindow *window = GDK_WINDOW (object);
   GdkWindowImplWayland *impl;
 
   g_return_if_fail (GDK_IS_WINDOW_IMPL_WAYLAND (object));
 
   impl = GDK_WINDOW_IMPL_WAYLAND (object);
 
-  if (gdk_wayland_window_is_exported (window))
-    gdk_wayland_window_unexport_handle (window);
+  if (gdk_wayland_window_is_exported (impl->wrapper))
+    gdk_wayland_window_unexport_handle (impl->wrapper);
 
   g_free (impl->title);