bcachefs: bch2_btree_iter_peek() now works with interior nodes

Needed by the next patch, which will be iterating over keys in nodes at
level 1.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2022-10-09 22:25:19 -04:00
commit 969576ecae