[gtk+] Fix a compiler warning.

[Matthias Clasen <matthiasc src gnome org>]

commit adfbc822025ffa969c0a39127af0d9447f34ca80
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Nov 1 18:16:46 2017 -0400

    Fix a compiler warning.

 gdk/broadway/gdkdisplay-broadway.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gdk/broadway/gdkdisplay-broadway.c b/gdk/broadway/gdkdisplay-broadway.c
index 515b524..8dabb86 100644
--- a/gdk/broadway/gdkdisplay-broadway.c
+++ b/gdk/broadway/gdkdisplay-broadway.c
@@ -113,7 +113,7 @@ _gdk_broadway_display_open (const gchar *display_name)
   display = g_object_new (GDK_TYPE_BROADWAY_DISPLAY, NULL);
   broadway_display = GDK_BROADWAY_DISPLAY (display);
 
-  _gdk_broadway_display_init_root_window (broadway_display);
+  _gdk_broadway_display_init_root_window (display);
 
   display->device_manager = _gdk_broadway_device_manager_new (display);