more fixes to compilation warnings from HP-UX build log. About 30% more to go

<sigh>


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5259 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/utilscmn.cpp

@@ -865,19 +865,14 @@ int wxMessageBox(const wxString& message, const wxString& caption, long style,
     {
         case wxID_OK:
             return wxOK;
-            break;
         case wxID_YES:
             return wxYES;
-            break;
         case wxID_NO:
             return wxNO;
-            break;
         default:
         case wxID_CANCEL:
             return wxCANCEL;
-            break;
     }
-    return ans;
 }
 
 #if wxUSE_TEXTDLG