- Unlock the page in an out of memory error code path in
  fs/ntfs/aops.c::ntfs_read_block().
- If fs/ntfs/aops.c::ntfs_read_page() is called on an uptodate page,
  just unlock the page and return. (This can happen due to ->writepage
  clearing PageUptodate() during write out of MstProtected()
  attributes.
- Remove leaked write code again.