Fix for wxPyInputStream, m_lastRead was getting incremented twice.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@17222 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/src/helpers.cpp

@@ -889,7 +889,6 @@ size_t wxPyCBInputStream::OnSysRead(void *buffer, size_t bufsize) {
     else
         m_lasterror = wxSTREAM_READ_ERROR;
     wxPyEndBlockThreads();
-    m_lastcount = o;
     return o;
 }