fix incorrect type bitmap in NSEC

src/knot/zone/semantic-check.c

@@ -409,7 +409,7 @@ static int check_rrsig(const zone_node_t *node, semchecks_data_t *data)
 static void bitmap_add_all_node_rrsets(dnssec_nsec_bitmap_t *bitmap,
                                        const zone_node_t *node)
 {
-	bool deleg = node->flags && NODE_FLAGS_DELEG;
+	bool deleg = node->flags & NODE_FLAGS_DELEG;
 	for (int i = 0; i < node->rrset_count; i++) {
 		knot_rrset_t rr = node_rrset_at(node, i);
 		if (deleg && (rr.type != KNOT_RRTYPE_NS &&