zfs_btree_last
data = zfs_btree_last(bt, &bt_idx);
ASSERT3U(data, ==, *(uint64_t *)zfs_btree_last(bt, &bt_idx));
data = zfs_btree_last(bt, &bt_idx);
ASSERT3U(node->data, ==, *(uint64_t *)zfs_btree_last(bt, NULL));
rs = zfs_btree_last(t, NULL);
range_seg_t *rs = zfs_btree_last(&msp->ms_unflushed_frees_by_size,
rs = zfs_btree_last(&msp->ms_allocatable_by_size, NULL);
rs = zfs_btree_last(t, NULL);
range_seg_t *rs = zfs_btree_last(&rt->rt_root, NULL);
void *zfs_btree_last(zfs_btree_t *, zfs_btree_index_t *);