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

src/osx/core/printmac.cpp

@@ -562,7 +562,7 @@ bool wxMacPrinter::Print(wxWindow *parent, wxPrintout *printout, bool prompt)
 
 wxDC* wxMacPrinter::PrintDialog(wxWindow *parent)
 {
-    wxDC* dc = (wxDC*) NULL;
+    wxDC* dc = NULL;
 
     wxPrintDialog dialog(parent, & m_printDialogData);
     int ret = dialog.ShowModal();