fix lint

hack/images/kicbase.Dockerfile

@@ -51,4 +51,4 @@ COPY out/preloaded-images-k8s-$KUBERNETES_VERSION.tar /preloaded-images.tar
 RUN tar xvf /preloaded-images.tar -C /
 
 FROM base
-COPY --from=1 /var/lib/docker /var/lib/docker 
+COPY --from=1 /var/lib/docker /var/lib/docker

hack/preload-images/preload_images.go

 /*
-Copyright 2016 The Kubernetes Authors All rights reserved.
+Copyright 2020 The Kubernetes Authors All rights reserved.
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
@@ -56,7 +56,11 @@ func main() {
 }
 
 func executePreloadImages() error {
-	defer deleteMinikube()
+	defer func() {
+		if err := deleteMinikube(); err != nil {
+			fmt.Println(err)
+		}
+	}()
 	if err := startMinikube(); err != nil {
 		return err
 	}