Unable to cancel authentication

[BICH0]

Environment

• OS: Arch Linux 6.0.9
• nody-greeter version: 1.5.1

Bug description

Unable to cancel authentication via lightdm.cancel_authentication() nor failing password.

Steps to reproduce

lightdm.authenticate("user")
lightdm.respond("worng password")
lightdm.in_authentication -> true
llightdm.cancel_authentication()
lightdm.in_authentication -> true

Expected behavior

When password is failed or lightdm.cancel_authentication() called set lightdm.in_authentication to false