lib/resolve: root zone is always encloser

bad control flow, the zone cut should be checked for root, as the second
condition checks if SNAME is at/below cut so the outcome is the same for
root query

lib/resolve.c

@@ -162,7 +162,7 @@ static int ns_fetch_cut(struct kr_query *qry, struct kr_request *req, knot_pkt_t
 		/* If at/subdomain of parent zone cut, start from its encloser.
 		 * This is for case when we get to a dead end (and need glue from parent), or DS refetch. */
 		struct kr_query *parent = qry->parent;
-		if (parent && qry->sname[0] != '\0' && knot_dname_in(parent->zone_cut.name, qry->sname)) {
+		if (parent && parent->zone_cut.name[0] != '\0' && knot_dname_in(parent->zone_cut.name, qry->sname)) {
 			const knot_dname_t *encloser = knot_wire_next_label(parent->zone_cut.name, NULL);
 			ret = kr_zonecut_find_cached(req->ctx, &qry->zone_cut, encloser, &txn, qry->timestamp.tv_sec, secured);
 		} else {