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/generic/calctrlg.cpp

@@ -1060,7 +1060,7 @@ void wxGenericCalendarCtrl::OnPaint(wxPaintEvent& WXUNUSED(event))
                 unsigned int day = date.GetDay();
                 wxString dayStr = wxString::Format(_T("%u"), day);
                 wxCoord width;
-                dc.GetTextExtent(dayStr, &width, (wxCoord *)NULL);
+                dc.GetTextExtent(dayStr, &width, NULL);
 
                 bool changedColours = false,
                      changedFont = false;