};
static void
-resize_cb (const union value *old_value, union value *new_value, void *aux_)
+resize_cb (const union value *old_value, union value *new_value, const void *aux_)
{
- struct resize_cb_aux *aux = aux_;
+ const struct resize_cb_aux *aux = aux_;
value_from_param (new_value, aux->new_width,
value_hash (old_value, aux->old_width, 0));