user32/tests: Fix a problem revealed by compilation in 64-bit mode.

dlls/user32/tests/win.c

@@ -322,7 +322,7 @@ static void test_parent_owner(void)
     if (0)
     {
     /* this test succeeds on NT but crashes on win9x systems */
-    ret = (HWND)SetWindowLongA( test, GWL_HWNDPARENT, (LONG_PTR)hwndMain2 );
+    ret = (HWND)SetWindowLongPtrA( test, GWLP_HWNDPARENT, (LONG_PTR)hwndMain2 );
     ok( !ret, "Set GWL_HWNDPARENT succeeded on desktop\n" );
     check_parents( desktop, 0, 0, 0, 0, 0, 0 );
     ok( !SetParent( desktop, hwndMain ), "SetParent succeeded on desktop\n" );