carl9170: remove dead branch in op_conf_tx callback

This patch removes the error branch for (queue > ar->hw->queues).
It is no longer needed anymore as the "queue" value is validated by
cfg80211's parse_txq_params() before the driver code gets called.

Some background:
In the old days (linux 2.6 and early 3.x), the parse_txq_params()
function did not verify the "queue" value. That's why these drivers
had to do it.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/carl9170/main.c

@@ -1387,13 +1387,8 @@ static int carl9170_op_conf_tx(struct ieee80211_hw *hw,
 	int ret;
 
 	mutex_lock(&ar->mutex);
-	if (queue < ar->hw->queues) {
 	memcpy(&ar->edcf[ar9170_qmap[queue]], param, sizeof(*param));
 	ret = carl9170_set_qos(ar);
-	} else {
-		ret = -EINVAL;
-	}
-
 	mutex_unlock(&ar->mutex);
 	return ret;
 }