rt2x00: Only initialize HT on rt2800 devices that support it.

Some RT28xx/RT30xx devices don't support 802.11n, when they are combined with
the RF2020 chipset. Ensure that HT is disabled for these devices.
Signed-off-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

@@ -2072,7 +2072,11 @@ int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
 	/*
 	 * Initialize HT information.
 	 */
+	if (!rt2x00_rf(chip, RF2020))
 		spec->ht.ht_supported = true;
+	else
+		spec->ht.ht_supported = false;
+
 	spec->ht.cap =
 	    IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 	    IEEE80211_HT_CAP_GRN_FLD |