f2fs: write missing last sum blk of file pinning section

While do not allocating a new section in advance for file pinning area, I
missed that we should write the sum block for the last segment of a file
pinning section.

Fixes: 9703d69 ("f2fs: support file pinning for zoned devices")
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Author: Daeho Jeong

fs/f2fs/segment.c

@@ -3559,6 +3559,8 @@ int f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
 	if (segment_full) {
 		if (type == CURSEG_COLD_DATA_PINNED &&
 		    !((curseg->segno + 1) % sbi->segs_per_sec)) {
+			write_sum_page(sbi, curseg->sum_blk,
+					GET_SUM_BLOCK(sbi, curseg->segno));
 			reset_curseg_fields(curseg);
 			goto skip_new_segment;
 		}