Merge tag 'iwlwifi-for-kalle-2018-03-16' of...

Merge tag 'iwlwifi-for-kalle-2018-03-16' of git://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-fixes

Third batch of iwlwifi fixes intended for 4.16:

* Fix an issue with the multicast queue;
* Fix IGTK handling;
* Fix some missing return value checks;
* Add support for a HW workaround for issues on some platforms;