fsck.f2fs: remove unused value

Remove build warning.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fsck/fsck.c b/fsck/fsck.c
index 95b4028..f7309d6 100644
--- a/fsck/fsck.c
+++ b/fsck/fsck.c
@@ -999,7 +999,6 @@
 
 int check_sit_types(struct f2fs_sb_info *sbi)
 {
-	struct seg_entry *se;
 	unsigned int i;
 	int err = 0;