fsck.f2fs: return 0 for no error was reported
fsck.f2fs: return 0 for no error was reported

When skipping fsck, return 0 with message.

Change-Id: I4010836e9045c1b0a230ab18d8dcf15988676db2
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

TeamTwisted/android_external_f2fs-tools,TeamTwisted/android_external_f2fs-tools