lzbe_get_boot_device
if (lzbe_get_boot_device(bt.obe_zpool, &nextboot) == 0 &&
if (lzbe_get_boot_device(rpool, &nextboot) == 0) {
if (lzbe_get_boot_device(bt.obe_zpool, &nextboot) == 0 &&
extern int lzbe_get_boot_device(const char *, char **);