wl1251: remove usage of deprecated noise value

Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251_rx.c

@@ -73,12 +73,6 @@ static void wl1251_rx_status(struct wl1251 *wl,
 
 	status->signal = desc->rssi;
 
-	/*
-	 * FIXME: guessing that snr needs to be divided by two, otherwise
-	 * the values don't make any sense
-	 */
-	status->noise = desc->rssi - desc->snr / 2;
-
 	status->freq = ieee80211_channel_to_frequency(desc->channel);
 
 	status->flag |= RX_FLAG_TSFT;