athn_tx_pending
if (athn_tx_pending(sc, ATHN_QID_BEACON)) {
if (athn_tx_pending(sc, ATHN_QID_BEACON)) {
if (!athn_tx_pending(sc, qid))
if (!athn_tx_pending(sc, qid))
if (athn_tx_pending(sc, qid))
int athn_tx_pending(struct athn_softc *, int);