[gtk/gtk-4-6] Fix last error reporting when calling GetClipboardOwner

[Matthias Clasen <matthiasc src gnome org>]

commit 206e837dde87bd972aae692eab5ae4429eacf8c0
Author: Luca Bacci <luca bacci982 gmail com>
Date:   Fri Feb 25 16:53:12 2022 +0100

    Fix last error reporting when calling GetClipboardOwner
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/1402

 gdk/win32/gdkclipdrop-win32.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/gdk/win32/gdkclipdrop-win32.c b/gdk/win32/gdkclipdrop-win32.c
index 5fa826c261..ec15f0fabd 100644
--- a/gdk/win32/gdkclipdrop-win32.c
+++ b/gdk/win32/gdkclipdrop-win32.c
@@ -1219,11 +1219,10 @@ inner_clipboard_window_procedure (HWND   hwnd,
             return DefWindowProcW (hwnd, message, wparam, lparam);
           }
 
+        SetLastError (0);
         hwnd_owner = GetClipboardOwner ();
-
-        if ((hwnd_owner == NULL) &&
-            (GetLastError () != ERROR_SUCCESS))
-            WIN32_API_FAILED ("GetClipboardOwner");
+        if (hwnd_owner == NULL && GetLastError () != 0)
+          WIN32_API_FAILED ("GetClipboardOwner");
 
         hwnd_opener = GetOpenClipboardWindow ();