zipkinreceiver: remove unnecessary internal argument (#9569)

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

receiver/zipkinreceiver/trace_receiver.go

@@ -48,8 +48,6 @@ var errNextConsumerRespBody = []byte(`"Internal Server Error"`)
 
 // zipkinReceiver type is used to handle spans received in the Zipkin format.
 type zipkinReceiver struct {
-	// addr is the address onto which the HTTP server will be bound
-	host         component.Host
 	nextConsumer consumer.Traces
 	id           config.ComponentID
 
@@ -68,7 +66,7 @@ type zipkinReceiver struct {
 
 var _ http.Handler = (*zipkinReceiver)(nil)
 
-// newReceiver creates a new zipkinreceiver.zipkinReceiver reference.
+// newReceiver creates a new zipkinReceiver reference.
 func newReceiver(config *Config, nextConsumer consumer.Traces, settings component.ReceiverCreateSettings) (*zipkinReceiver, error) {
 	if nextConsumer == nil {
 		return nil, componenterror.ErrNilNextConsumer
@@ -95,7 +93,6 @@ func (zr *zipkinReceiver) Start(_ context.Context, host component.Host) error {
 	}
 
 	var err error
-	zr.host = host
 	zr.server, err = zr.config.HTTPServerSettings.ToServer(host, zr.settings.TelemetrySettings, zr)
 	if err != nil {
 		return err