btrfs: clarify btrfs_lookup_bio_sums documentation

Fix a couple of issues in the btrfs_lookup_bio_sums documentation:

* The bio doesn't need to be a btrfs_io_bio if dst was provided. Move
  the declaration in the code to make that clear, too.
* dst must be large enough to hold nblocks * csum_size, not just
  csum_size.

Reviewed-by: Josef Bacik <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Nikolay Borisov <[email protected]>
Signed-off-by: Omar Sandoval <[email protected]>
Signed-off-by: David Sterba <[email protected]>

0 files changed, 0 insertions, 0 deletions