[gtk/gtk-3-24: 1/2] Fix function signature

[Matthias Clasen <matthiasc src gnome org>]

commit 1697be5e44b129b064dd747c3649a0841296a8e8
Author: Luca Bacci <luca bacci982 gmail com>
Date:   Thu Apr 23 19:10:30 2020 +0200

    Fix function signature

 gdk/gdkoffscreenwindow.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gdk/gdkoffscreenwindow.c b/gdk/gdkoffscreenwindow.c
index 710bd94d7c..860df11eba 100644
--- a/gdk/gdkoffscreenwindow.c
+++ b/gdk/gdkoffscreenwindow.c
@@ -646,6 +646,7 @@ gdk_offscreen_window_set_wmfunctions (GdkWindow         *window,
 
 static void
 gdk_offscreen_window_begin_move_drag (GdkWindow *window,
+                                      GdkDevice *device,
                                       gint       button,
                                       gint       root_x,
                                       gint       root_y,