Adding DeleteResult for rackspace.blockstorage.v1.volumes.Delete
diff --git a/rackspace/blockstorage/v1/volumes/delegate_test.go b/rackspace/blockstorage/v1/volumes/delegate_test.go
index 2383c54..b44564c 100644
--- a/rackspace/blockstorage/v1/volumes/delegate_test.go
+++ b/rackspace/blockstorage/v1/volumes/delegate_test.go
@@ -89,8 +89,8 @@
 
 	os.MockDeleteResponse(t)
 
-	err := Delete(fake.ServiceClient(), "d32019d3-bc6e-4319-9c1d-6722fc136a22")
-	th.AssertNoErr(t, err)
+	res := Delete(fake.ServiceClient(), "d32019d3-bc6e-4319-9c1d-6722fc136a22")
+	th.AssertNoErr(t, res.Err)
 }
 
 func TestUpdate(t *testing.T) {