fixes stupid 'Cannot pass parameter by reference' bug

hi saz,

sorry if i'm not doing this right - this is my first pull-request.
i don't really know how to tell github, i only want you to pull the latest commit.

anyhow - i think your module is suffering the same problem, that is fixed here:
https://github.com/nutztherookie/owncloud-user_django_auth/commit/9634b832336326a981076537fed6de797574246e


cheers
nutz