- ws->control_idx = xzalloc (mt->n_layers
- * sizeof *ws->control_idx);
- ws->instances = xzalloc (mt->n_layers
- * sizeof *ws->instances);
+ ws->control_idx = xcalloc (mt->n_layers, sizeof *ws->control_idx);
+ ws->instances = xcalloc (mt->n_layers, sizeof *ws->instances);