ath6kl_find_sta_by_aid
struct ath6kl_sta *ath6kl_find_sta_by_aid(struct ath6kl *ar, u8 aid);
sta = ath6kl_find_sta_by_aid(ar, (keyid >> 2));
conn = ath6kl_find_sta_by_aid(ar, aid);
sta = ath6kl_find_sta_by_aid(vif->ar, aid);
sta = ath6kl_find_sta_by_aid(vif->ar, aid);