change CreateOpts from structure to map to avoid default null values
diff --git a/openstack/blockstorage/v1/volumes/requests.go b/openstack/blockstorage/v1/volumes/requests.go
index b1f45cd..34ae20e 100644
--- a/openstack/blockstorage/v1/volumes/requests.go
+++ b/openstack/blockstorage/v1/volumes/requests.go
@@ -11,7 +11,7 @@
 	if err != nil {
 		return v, err
 	}
-	url := c.GetVolumeURL()
+	url := c.GetVolumesURL()
 	_, err = perigee.Request("POST", url, perigee.Options{
 		Results: &v,
 		ReqBody: map[string]interface{}{