message: rafs: fix a bug in rafs v6 introduced during refactor
  Fix a bug in rafs v6 introduced during refactor, which get wrong offset
  for directory inode with xattrs.
diff: @@ -444,7 +444,7 @@ impl OndiskInodeWrapper {
  (inode.union() as u64 * EROFS_BLOCK_SIZE) as usize
  + index * EROFS_BLOCK_SIZE as usize
  } else {
  - self.offset as usize + Self::inode_xattr_size(inode) as usize
  + self.offset as usize + Self::inode_size(inode) + Self::xattr_size(inode)
  }
  }
  _ => return Err(RafsError::InvalidImageData),
  