zfs_crypto_load_key
ret = zfs_crypto_load_key(zhp, cb->cb_noop, cb->cb_keylocation);
ret = zfs_crypto_load_key(zhp, B_FALSE, NULL);
extern int zfs_crypto_load_key(zfs_handle_t *, boolean_t, char *);
ret = zfs_crypto_load_key(zhp, B_FALSE, NULL);
rc = zfs_crypto_load_key(zhp, B_FALSE, NULL);