fsck.f2fs: preserve orphan blocks
fsck.f2fs: preserve orphan blocks

If fsck.f2fs found some orphan blocks, previously fsck.f2fs drops them and
fixes checkpoint, resulting in false alarm on corruption.
This patch preserves orphan blocks to avoid such the alarms.

Change-Id: I82de5bf91b5f2e4c2203a2b3a1500e8aa687c0ca
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

TeamTwisted/android_external_f2fs-tools,TeamTwisted/android_external_f2fs-tools