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/palmos/enhmeta.h

@@ -37,7 +37,7 @@ public:
         { Free(); }
 
     // display the picture stored in the metafile on the given DC
-    bool Play(wxDC *dc, wxRect *rectBound = (wxRect *)NULL);
+    bool Play(wxDC *dc, wxRect *rectBound = NULL);
 
     // accessors
     virtual bool IsOk() const { return m_hMF != 0; }