fix: server lease nil pointer dereference

pkg/server/server_manager.go

@@ -124,8 +124,7 @@ func (mgr *ServerManager) RegisterServer() error {
 	Log.Infof("RegisterServer is done. leaseId is %v\n", mgr.leaseId)
 	go func() {
 		for {
-			leaseResp := <-mgr.keepAliveChan
-			Log.Infof("update lease success:%d", leaseResp.TTL)
+			<-mgr.keepAliveChan
 		}
 	}()
 	return nil

services/registry/product.go

@@ -122,7 +122,7 @@ func (r *Registry) ValidateProduct(key string, reply *models.Product) error {
 	}
 
 	if reply.ProductKey != key {
-		return errors.New("product key not match.")
+		return errors.New("product key not match")
 	}
 
 	return nil