[gtk/fix-printoperation-win32] gtkprintoperation-win32.c: Fix build on Visual Studio

[Chun-wei Fan <fanchunwei src gnome org>]

commit dfbcc0849b4f7c1a4900861743b300effb163c0c
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Thu Nov 25 19:00:22 2021 +0800

    gtkprintoperation-win32.c: Fix build on Visual Studio
    
    Cast the result of GetWindowLongPtrW() to void * so that we won't get
    the C4047 warnings, which are considered an error in building the GTK
    stack.

 gtk/gtkprintoperation-win32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkprintoperation-win32.c b/gtk/gtkprintoperation-win32.c
index abd4f7de95..34a9b2fa0c 100644
--- a/gtk/gtkprintoperation-win32.c
+++ b/gtk/gtkprintoperation-win32.c
@@ -1484,7 +1484,7 @@ pageDlgProc (HWND wnd, UINT message, WPARAM wparam, LPARAM lparam)
     }
   else 
     {
-      gpointer user_data = GetWindowLongPtrW (wnd, GWLP_USERDATA);
+      gpointer user_data = (void *)GetWindowLongPtrW (wnd, GWLP_USERDATA);
 
       if (!user_data)
         return FALSE;