fix busy loop in node config controller (#340)

src/k8s/pkg/utils/k8s/configmap.go

@@ -20,16 +20,17 @@ func (c *Client) WatchConfigMap(ctx context.Context, namespace string, name stri
 		select {
 		case <-ctx.Done():
 			return nil
-		case evt := <-w.ResultChan():
-			if evt.Object != nil {
-				configMap, ok := evt.Object.(*v1.ConfigMap)
-				if !ok {
-					return fmt.Errorf("expected a ConfigMap but received %#v", evt.Object)
-				}
+		case evt, ok := <-w.ResultChan():
+			if !ok {
+				return fmt.Errorf("watch closed")
+			}
+			configMap, ok := evt.Object.(*v1.ConfigMap)
+			if !ok {
+				return fmt.Errorf("expected a ConfigMap but received %#v", evt.Object)
+			}
 
-				if err := reconcile(configMap); err != nil {
-					log.Println(fmt.Errorf("failed to reconcile configmap, namespace: %s name: %s: %w", namespace, name, err))
-				}
+			if err := reconcile(configMap); err != nil {
+				log.Println(fmt.Errorf("failed to reconcile configmap, namespace: %s name: %s: %w", namespace, name, err))
 			}
 		}
 	}