zpool_in_use
ret = zpool_in_use(g_zfs, fd, &state, &name, &inuse);
if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) != 0 ||
if (zpool_in_use(g_zfs, fd, &state, &name, &inuse) == 0 && inuse) {
extern int zpool_in_use(libzfs_handle_t *, int, pool_state_t *, char **,