length passed to WideCharToMultiByte() was off by one in the last commit

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@51557 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/ole/oleutils.cpp

@@ -96,8 +96,8 @@ WXDLLEXPORT wxString wxConvertStringFromOle(BSTR bStr)
 #else
     wxString str;
     if ( !::WideCharToMultiByte(CP_ACP, 0 /* no flags */,
-                                bStr, len + 1 /* include last NUL */,
-                                wxStringBuffer(str, len), len,
+                                bStr, len /* not necessary NUL-terminated */,
+                                wxStringBuffer(str, len + 1), len + 1,
                                 NULL, NULL /* no default char */) )
     {
         str.clear();