upstream: imp cognit

upstream/resolver.go

@@ -186,9 +186,6 @@ func (r *UpstreamResolver) lookup(host, network string) (ips []netip.Addr, err e
 	switch network {
 	case "ip4", "ip6":
 		ips, err = r.resolve(host, network)
-		if err != nil {
-			return []netip.Addr{}, err
-		}
 	case "ip":
 		resCh := make(chan any, 2)
 		go r.resolveAsync(resCh, host, "ip4")
@@ -204,14 +201,16 @@ func (r *UpstreamResolver) lookup(host, network string) (ips []netip.Addr, err e
 			}
 		}
 
-		if err = errors.Join(errs...); len(ips) == 0 && err != nil {
-			return nil, err
-		}
+		err = errors.Join(errs...)
 	default:
 		return []netip.Addr{}, fmt.Errorf("unsupported network %s", network)
 	}
 
-	return ips, nil
+	if len(ips) == 0 {
+		ips = []netip.Addr{}
+	}
+
+	return ips, err
 }
 
 // StaticResolver is a resolver which always responds with an underlying slice