fixed incorrect XtVaXXX() function call (thanks to g++ 4 for detecting this!)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38158 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/app.cpp

@@ -374,7 +374,7 @@ WXWidget wxCreateTopLevelRealizedWidget( WXDisplay* WXUNUSED(display) )
 {
     Widget rTlw = XtVaCreateWidget( "dummy_widget", topLevelShellWidgetClass,
                                     (Widget)wxTheApp->GetTopLevelWidget(),
-                                     NULL, 0 );
+                                     NULL );
     XtSetMappedWhenManaged( rTlw, False );
     XtRealizeWidget( rTlw );