fix: fix contrib registry eureka watcher as *watcher (#2693)

contrib/registry/eureka/watcher.go

@@ -33,7 +33,7 @@ func newWatch(ctx context.Context, cli *API, serverName string) (*watcher, error
 	return w, e
 }
 
-func (w watcher) Next() (services []*registry.ServiceInstance, err error) {
+func (w *watcher) Next() (services []*registry.ServiceInstance, err error) {
 	select {
 	case <-w.ctx.Done():
 		return nil, w.ctx.Err()

contrib/registry/servicecomb/registry.go

@@ -147,6 +147,7 @@ func (r *Registry) Register(_ context.Context, svcIns *registry.ServiceInstance)
 		return err
 	}
 	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
 	go func() {
 		for {
 			<-ticker.C