scan_ffs prints negative size

[Denis Fondras]

Small diff to fix size printing.

Before :
$ doas scan_ffs -v sd0
block 55167 id 758d4818,f2894c98 size -859043093

After:
$ doas ./obj/scan_ffs -v sd0
block 55167 id 758d4818,f2894c98 size 3435924203

Index: scan_ffs.c
===================================================================
RCS file: /cvs/src/sbin/scan_ffs/scan_ffs.c,v
retrieving revision 1.23
diff -u -p -r1.23 scan_ffs.c
--- scan_ffs.c  28 Jun 2019 13:32:46 -0000      1.23
+++ scan_ffs.c  16 May 2020 12:19:18 -0000
@@ -70,7 +70,7 @@ ufsscan(int fd, daddr_t beg, daddr_t end
                        sb = (struct fs*)(&buf[n]);
                        if (sb->fs_magic == FS_MAGIC) {
                                if (flags & FLAG_VERBOSE)
-                                       printf("block %lld id %x,%x size %d\n",
+                                       printf("block %lld id %x,%x size %u\n",
                                            (long long)(blk + (n/512)),
                                            sb->fs_id[0], sb->fs_id[1],
                                            sb->fs_ffs1_size);