xalloc_array_zero
dt_col->inputs = xalloc_array_zero(dt_col->count,
nsd->dt_collector_fd_send = (int*)xalloc_array_zero(dt_col->count,
nsd->dt_collector_fd_recv = (int*)xalloc_array_zero(dt_col->count,
struct nsdst** a = xalloc_array_zero(num, sizeof(struct nsdst*));
rrl_array = xalloc_array_zero(sizeof(struct rrl_bucket),
udb_ptr** newram = (udb_ptr**)xalloc_array_zero(
udb->ram_hash = (udb_ptr**)xalloc_array_zero(sizeof(udb_ptr*),
void *xalloc_array_zero(size_t num, size_t size);