f2fs: format segment_info's show for better legibility

The original segment_info's show is a bit out-of-format:

[root@guz Demoes]# cat /proc/fs/f2fs/loop0/segment_info
0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
......
0 0 0 0 0 0 0 0 0 0
0 0 1 0 0 1 [root@guz Demoes]#

so we fix it here for better legibility.
[root@guz Demoes]# cat /proc/fs/f2fs/loop0/segment_info
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
......
0 0 0 0 0 0 0 0 0 0
0 0 1 0 0 1
[root@guz Demoes]#
Signed-off-by: NGu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: NJaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/super.c

@@ -546,11 +546,12 @@ static int segment_info_seq_show(struct seq_file *seq, void *offset)
 
 	for (i = 0; i < total_segs; i++) {
 		seq_printf(seq, "%u", get_valid_blocks(sbi, i, 1));
-		if (i != 0 && (i % 10) == 0)
-			seq_puts(seq, "\n");
+		if ((i % 10) == 9 || i == (total_segs - 1))
+			seq_putc(seq, '\n');
 		else
-			seq_puts(seq, " ");
+			seq_putc(seq, ' ');
 	}
+
 	return 0;
 }