fsck.f2fs: declare static function
fsck.f2fs: declare static function

This avoids the following warning.

mount.c:783:27: warning: SM_I is static but used in inline function
check_seg_range which is not static.

Change-Id: I1321fc29bbfc5b6e1c966d1537a12b0758ac3a50
Signed-off-by: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>

TeamTwisted/android_external_f2fs-tools,TeamTwisted/android_external_f2fs-tools