Hi,
this simple patch aims to fix
https://fedorahosted.org/sssd/ticket/2925
which is needed for older platforms like CentOS6 or RHEL6 to allow to
unlock the screen with the help of a Smartcard as well.
To make it more easy changeable in future I added
https://fedorahosted.org/sssd/ticket/2926 as a reminder for me.
bye,
Sumit