Repair the UFS2 superblock location consistency check so that it succeeds

on valid superblocks instead of issuing the error "not a BSD filesystem".
fs_sblockloc is a byte offset, not a fragment number. This change makes
quot work properly on UFS2 filesystems, which is important now that UFS2
is the default.

usr.sbin/quot/quot.c

@@ -563,7 +563,7 @@ quot(name,mp)
 		fs = (struct fs *)superblock;
 		if ((fs->fs_magic == FS_UFS1_MAGIC ||
 		     (fs->fs_magic == FS_UFS2_MAGIC &&
-		      fs->fs_sblockloc == numfrags(fs, sblock_try[i]))) &&
+		      fs->fs_sblockloc == sblock_try[i])) &&
 		    fs->fs_bsize <= MAXBSIZE &&
 		    fs->fs_bsize >= sizeof(struct fs))
 			break;