Oops, scoutfs_btree_prev() asked btree_walk() for the key for the next
block, not the previous block to search when it's walk lands in the
space before all the items in the leaf block.
I saw it when truncate's check_size_eq constraint failed on items
outside the range which stopped the truncate and left inodes, extents,
and the orphan item around after rm -rf.
Signed-off-by: Zach Brown <zab@versity.com>
Reviewed-by: Mark Fasheh <mfasheh@versity.com>