- .data_leaves = xzalloc (old->n_leaves * sizeof *new->data_leaves),
- .presentation_leaves = xzalloc (old->n_leaves
- * sizeof *new->presentation_leaves),
+ .data_leaves = xcalloc (old->n_leaves , sizeof *new->data_leaves),
+ .presentation_leaves = xcalloc (old->n_leaves
+ , sizeof *new->presentation_leaves),