lint fixes

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

broker/memory.go

@@ -122,11 +122,10 @@ func (m *memoryBroker) publish(ctx context.Context, msgs []*Message, opts ...Pub
 				p.message = v.Body
 			} else {
 				p.topic, _ = v.Header.Get(metadata.HeaderTopic)
-				buf, err := m.opts.Codec.Marshal(v)
+				p.message, err = m.opts.Codec.Marshal(v)
 				if err != nil {
 					return err
 				}
-				p.message = buf
 			}
 			msgTopicMap[p.topic] = append(msgTopicMap[p.topic], p)
 		}

broker/memory_test.go

@@ -28,7 +28,7 @@ func TestMemoryBatchBroker(t *testing.T) {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	msgs := make([]*Message, 0, 0)
+	msgs := make([]*Message, 0, count)
 	for i := 0; i < count; i++ {
 		message := &Message{
 			Header: map[string]string{
@@ -74,7 +74,7 @@ func TestMemoryBroker(t *testing.T) {
 		t.Fatalf("Unexpected error subscribing %v", err)
 	}
 
-	msgs := make([]*Message, 0, 0)
+	msgs := make([]*Message, 0, count)
 	for i := 0; i < count; i++ {
 		message := &Message{
 			Header: map[string]string{