linux-wandboard

iwlwifi: add iwl_sta_id()

In places where the station struct is
guaranteed to exist (presumably), use
this helper to get the station ID out
of it (and warn if there's no station
struct after all).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>