fsck.f2fs: show ckeckpoint version info
fsck.f2fs: show ckeckpoint version info

This patch shows the valid checkpoint version number.

Change-Id: I78b8a32af9427bbcf37ed21d3aeb83eabf46d6a7
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

TeamTwisted/android_external_f2fs-tools,TeamTwisted/android_external_f2fs-tools