no naked returns in go; fix auth v3 unit tests
diff --git a/openstack/cdn/v1/serviceassets/requests.go b/openstack/cdn/v1/serviceassets/requests.go
index e78508d..80c908f 100644
--- a/openstack/cdn/v1/serviceassets/requests.go
+++ b/openstack/cdn/v1/serviceassets/requests.go
@@ -47,4 +47,5 @@
 		url += q
 	}
 	_, r.Err = c.Delete(url, nil)
+	return
 }