f2fs: reassign new segment for mode=lfs

Otherwise we can remain wrong curseg->next_blkoff, resulting in fsck failure.
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/segment.c

@@ -1428,9 +1428,6 @@ void allocate_new_segments(struct f2fs_sb_info *sbi)
 	unsigned int old_segno;
 	int i;
 
-	if (test_opt(sbi, LFS))
-		return;
-
 	for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
 		curseg = CURSEG_I(sbi, i);
 		old_segno = curseg->segno;