don't use annoying and unneeded in C++ casts of NULL to "T *" in all other files neither

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58227 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/prntdlgg.h

@@ -141,7 +141,7 @@ class WXDLLIMPEXP_CORE wxGenericPrintDialog : public wxPrintDialogBase
 {
 public:
     wxGenericPrintDialog(wxWindow *parent,
-                         wxPrintDialogData* data = (wxPrintDialogData*)NULL);
+                         wxPrintDialogData* data = NULL);
     wxGenericPrintDialog(wxWindow *parent, wxPrintData* data);
 
     virtual ~wxGenericPrintDialog();