[#411] Remove unnecessary pointers for sync objects

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>

pkg/services/notificator/nats/service.go

@@ -25,7 +25,7 @@ type Writer struct {
 	js nats.JetStreamContext
 	nc *nats.Conn
 
-	m              *sync.RWMutex
+	m              sync.RWMutex
 	createdStreams map[string]struct{}
 	opts
 }
@@ -84,7 +84,6 @@ func (n *Writer) Notify(topic string, address oid.Address) error {
 // New creates new Writer.
 func New(oo ...Option) *Writer {
 	w := &Writer{
-		m:              &sync.RWMutex{},
 		createdStreams: make(map[string]struct{}),
 		opts: opts{
 			log:   &logger.Logger{Logger: zap.L()},