[1.0.X] Fixed #10017 - PasswordResetForm.clean_email was not returning the value.

Thanks Zak Johnson, Leo

Backport of r9906 from trunk.



git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@9907 bcc190cf-cafb-0310-a4f2-bffc1f526a37