ath_tx_start
int ath_tx_start(struct ieee80211_hw *hw, struct sk_buff *skb,
if (ath_tx_start(sc->hw, skb, &txctl))
if (ath_tx_start(sc->hw, skb, &txctl)) {
if (ath_tx_start(hw, skb, &txctl) != 0) {
if (ath_tx_start(hw, skb, &txctl) != 0) {