[gtk+] broadway: Don't crash on startup

[Benjamin Otte <otte src gnome org>]

commit 0cad0caf7dcdc29955ed7dde644a762d2f327d7f
Author: Benjamin Otte <otte redhat com>
Date:   Fri Nov 3 01:55:01 2017 +0100

    broadway: Don't crash on startup

 gdk/broadway/gdkwindow-broadway.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/broadway/gdkwindow-broadway.c b/gdk/broadway/gdkwindow-broadway.c
index 46fc891..f79ae81 100644
--- a/gdk/broadway/gdkwindow-broadway.c
+++ b/gdk/broadway/gdkwindow-broadway.c
@@ -197,7 +197,7 @@ _gdk_broadway_display_init_root_window (GdkDisplay *display)
 
   g_assert (broadway_display->root_window == NULL);
 
-  broadway_display->root_window = g_object_new (GDK_TYPE_BROADWAY_WINDOW, NULL);
+  broadway_display->root_window = _gdk_display_create_window (display);
 
   window = broadway_display->root_window;
   window->impl = g_object_new (GDK_TYPE_WINDOW_IMPL_BROADWAY, NULL);