btrfs: update comment and drop assertion in extent item lookup in find_parent_nodes()

Same comment was added to this type of error, unify that and drop the
assertion as we'd find out quickly that something is wrong after
returning -EUCLEAN.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2024-01-24 22:29:46 +01:00
commit 5b9579893a