fsdb: add missing bufinit() call

The bufinit() call in fsck_ffs was moved in commit f190f9193b
from a function that is shared with fsdb to one that is private to fsck_ffs,
so add a bufinit() call in fsdb to compensate for that.

Reviewed by:	mckusick
Sponsored by:	Netflix

sbin/fsdb/fsdb.c

@@ -111,6 +111,7 @@ main(int argc, char *argv[])
 		fsys = argv[0];
 
 	sblock_init();
+	bufinit();
 	if (!setup(fsys))
 		errx(1, "cannot set up file system `%s'", fsys);
 	if (fswritefd < 0)