bcachefs: Fix bch2_check_nlinks() for snapshots

When searching the link table for the matching inode, we were searching
for a specific - incorrect - snapshot ID as well, causing us to fail to
find the inode.

Signed-off-by: Kent Overstreet <[e-mail]>

fs/bcachefs/fsck.c

···
 	const struct nlink *l = _l;
 	const struct nlink *r = _r;
 
-	return cmp_int(l->inum, r->inum) ?: cmp_int(l->snapshot, r->snapshot);
+	return cmp_int(l->inum, r->inum);
 }
 
 static void inc_link(struct bch_fs *c, struct snapshots_seen *s,