- Apply block optimization added to fs/ntfs/aops.c::ntfs_read_block()
  to fs/ntfs/compress.c::ntfs_file_read_compressed_block() as well.
- Drop the "file" from ntfs_file_read_compressed_block().
- Rename fs/ntfs/aops.c::ntfs_enb_buffer_read_async() to
  ntfs_end_buffer_async_read() (more like the fs/buffer.c counterpart).
- Update ntfs_end_buffer_async_read() with the improved logic from
  its updated counterpart fs/buffer.c::end_buffer_async_read(). Apply
  further logic improvements to better determine when we set PageError.
- Update submission of buffers in fs/ntfs/aops.c::ntfs_read_block() to
  check for the buffers being uptodate first in line with the updated
  fs/buffer.c::block_read_full_page(). This plugs a small race
  condition.