fix build
delete unused member

Pull from upstream:
Revision: d200f3ccc8cdb429fa1f4710de8be71c13540370
Author: Cristi Cobzarenco <cristi.cobzarenco@gmail.com>
Date: 2014-1-21 10:00:37
Message:
Migrated to C++11, removing Boost deps.
use !=

Pull from upstream:
Revision: d200f3ccc8cdb429fa1f4710de8be71c13540370
Author: Cristi Cobzarenco <cristi.cobzarenco@gmail.com>
Date: 2014-1-21 10:00:37
Message:
Migrated to C++11, removing Boost deps.