ar9170: fix read & write outside array bounds

queue == __AR9170_NUM_TXQ would cause a bug on the next line.

found by Smatch ( http://repo.or.cz/w/smatch.git ).

Cc: [e-mail]
Reported-by: Dan Carpenter <[e-mail]>
Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Christian Lamparter <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/ath/ar9170/main.c

···
 	int ret;
 
 	mutex_lock(&ar->mutex);
-	if ((param) && !(queue > __AR9170_NUM_TXQ)) {
+	if (queue < __AR9170_NUM_TXQ) {
 		memcpy(&ar->edcf[ar9170_qos_hwmap[queue]],
 		       param, sizeof(*param));
 
 		ret = ar9170_set_qos(ar);
-	} else
+	} else {
 		ret = -EINVAL;
+	}
 
 	mutex_unlock(&ar->mutex);
 	return ret;