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/notebook.cpp

@@ -112,7 +112,7 @@ static int GetPageId(wxTabView *tabview, wxNotebookPage *page)
 // common part of all ctors
 void wxNotebook::Init()
 {
-    m_tabView = (wxNotebookTabView*) NULL;
+    m_tabView = NULL;
     m_nSelection = -1;
 }