mkfs.f2fs: remove extent_cache entry for parent directory
mkfs.f2fs: remove extent_cache entry for parent directory

Currently, directory should not have any extent cache entry.
Otherwise, fsck.f2fs will trigger a false-alarmed report.

Change-Id: I716e290308eb5f0ea4b59f1a262d20a8fd303a0e
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

TeamExodus/external_f2fs-tools,TeamExodus/external_f2fs-tools