assert when sorting wxArrayString twice fixed

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7342 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/string.cpp

@@ -2128,6 +2128,9 @@ void wxArrayString::Sort(CompareFunction compareFunction)
 
   DoSort();
 
+  // reset it to NULL so that Sort(bool) will work the next time
+  gs_compareFunction = NULL;
+
   END_SORT();
 }