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/log.h

@@ -378,7 +378,7 @@ class WXDLLIMPEXP_BASE wxLogStderr : public wxLog
 {
 public:
     // redirect log output to a FILE
-    wxLogStderr(FILE *fp = (FILE *) NULL);
+    wxLogStderr(FILE *fp = NULL);
 
 protected:
     // implement sink function