sometimes unused parameter warnings are really worth paying attention to

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55243 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/ustring.h

@@ -253,7 +253,7 @@ public:
    #if SIZEOF_WCHAR_T == 2
         return assignFromUTF16( str.wc_str() );
    #else
-        return assign( wc_str() );
+        return assign( str.wc_str() );
    #endif
 #endif
     }