Adding DeleteResult for snapshots.Delete
diff --git a/openstack/blockstorage/v1/snapshots/requests_test.go b/openstack/blockstorage/v1/snapshots/requests_test.go
index 8db55d9..d0f9e88 100644
--- a/openstack/blockstorage/v1/snapshots/requests_test.go
+++ b/openstack/blockstorage/v1/snapshots/requests_test.go
@@ -99,6 +99,6 @@
 
 	MockDeleteResponse(t)
 
-	err := Delete(client.ServiceClient(), "d32019d3-bc6e-4319-9c1d-6722fc136a22")
-	th.AssertNoErr(t, err)
+	res := Delete(client.ServiceClient(), "d32019d3-bc6e-4319-9c1d-6722fc136a22")
+	th.AssertNoErr(t, res.Err)
 }