fsck.f2fs: add basic compress related check/fix

* check/fix i_compr_blocks
* check/fix compressed flag in i_flags when compression is not
  supported.

Signed-off-by: Robin Hsu <robinhsu@google.com>
[Jaegeuk Kim: minor coding style]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
4 files changed