gcc 3.1 warning fixes (patch 598343)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@16687 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/widgets/slider.cpp

@@ -490,7 +490,7 @@ void SliderWidgetsPage::OnSlider(wxScrollEvent& event)
         If this assert is triggered, there is an unknown slider event which
         should be added to the above eventNames array.
     */
-    wxASSERT_MSG(index >= 0 && index < WXSIZEOF(eventNames),
+    wxASSERT_MSG(index >= 0 && (size_t)index < WXSIZEOF(eventNames),
                  wxT("Unknown slider event") );