Fix same compilation again, I guess 0 was

meant to initialize the wxTreeItemId to
    nothing.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40717 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/treectrl.cpp

@@ -293,7 +293,7 @@ class wxTreeItemParam
 {
 public:
     wxTreeItemParam()
-        : m_item((void*)NULL),
+        : m_item((long int)0),
           m_data(NULL)
     {
         for ( size_t n = 0; n < WXSIZEOF(m_images); n++ )