l9p_calloc
ret = l9p_calloc(1, sizeof(*ret));
file = l9p_calloc(1, sizeof (struct l9p_fid));
server = l9p_calloc(1, sizeof (*server));
req = l9p_calloc(1, sizeof (struct l9p_request));
item = l9p_calloc(1, sizeof(struct ht_item));
h->ht_entries = l9p_calloc((size_t)size, sizeof(struct ht_entry));
*s = l9p_calloc(1, len + 1);
sc = l9p_calloc(1, sizeof(*sc));