ar9170: do not discard valuable DUPOFDM frames

This patch enables the driver to process all incoming
dupofdm-modulated frames when operating in HT40 mode.
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -850,6 +850,7 @@ static int ar9170_rx_mac_status(struct ar9170 *ar,
 		}
 		break;
 
+	case AR9170_RX_STATUS_MODULATION_DUPOFDM:
 	case AR9170_RX_STATUS_MODULATION_OFDM:
 		switch (head->plcp[0] & 0xf) {
 		case 0xb:
@@ -897,8 +898,7 @@ static int ar9170_rx_mac_status(struct ar9170 *ar,
 		status->flag |= RX_FLAG_HT;
 		break;
 
-	case AR9170_RX_STATUS_MODULATION_DUPOFDM:
-		/* XXX */
+	default:
 		if (ar9170_nag_limiter(ar))
 			printk(KERN_ERR "%s: invalid modulation\n",
 			       wiphy_name(ar->hw->wiphy));