go report card fixes (#3182)

Went over the list at https://goreportcard.com/report/github.com/coredns/coredns
and removed/fix some code to make it slightly happier.
Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/cancel/cancel_test.go

@@ -34,7 +34,6 @@ func (s sleepPlugin) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.
 			return 0, nil
 		}
 	}
-	return 0, nil
 }
 
 func TestCancel(t *testing.T) {

plugin/done.go

@@ -10,5 +10,4 @@ func Done(ctx context.Context) bool {
 	default:
 		return false
 	}
-	return false
 }

plugin/etcd/msg/service_test.go

@@ -123,12 +123,3 @@ func TestGroup(t *testing.T) {
 		t.Fatalf("Failure to group seventh set: %v", sx)
 	}
 }
-
-func BenchmarkNewSRV(b *testing.B) {
-	s := &Service{Host: "www,example.org", Port: 8080}
-	for n := 0; n < b.N; n++ {
-		srv := s.NewSRV("www.example.org.", 16)
-		// this assignment makes sure s.NewSRV doesn't get optimized out
-		srv = srv
-	}
-}

plugin/kubernetes/controller_test.go

@@ -78,7 +78,7 @@ func generateEndpoints(cidr string, client kubernetes.Interface) {
 			},
 		}
 		ep.ObjectMeta.Name = "svc" + strconv.Itoa(count)
-		_, err = client.CoreV1().Endpoints("testns").Create(ep)
+		client.CoreV1().Endpoints("testns").Create(ep)
 		count++
 	}
 }

test/secondary_test.go

@@ -73,7 +73,7 @@ func TestSecondaryZoneTransfer(t *testing.T) {
 	var r *dns.Msg
 	// This is now async; we need to wait for it to be transferred.
 	for i := 0; i < 10; i++ {
-		r, err = dns.Exchange(m, udp)
+		r, _ = dns.Exchange(m, udp)
 		if len(r.Answer) != 0 {
 			break
 		}