wl1251: remove depcreated qual usage

Fixes warnings:

drivers/net/wireless/wl12xx/wl1251_rx.c: In function 'wl1251_rx_status':
drivers/net/wireless/wl12xx/wl1251_rx.c:75:
  warning: 'qual' is deprecated (declared at include/net/mac80211.h:555)
drivers/net/wireless/wl12xx/wl1251_rx.c:77:
  warning: 'qual' is deprecated (declared at include/net/mac80211.h:555)
drivers/net/wireless/wl12xx/wl1251_rx.c:77:
  warning: 'qual' is deprecated (declared at include/net/mac80211.h:555)
drivers/net/wireless/wl12xx/wl1251_rx.c:77:
  warning: 'qual' is deprecated (declared at include/net/mac80211.h:555)
drivers/net/wireless/wl12xx/wl1251_rx.c:78:
  warning: 'qual' is deprecated (declared at include/net/mac80211.h:555)
drivers/net/wireless/wl12xx/wl1251_rx.c:78:
  warning: 'qual' is deprecated (declared at include/net/mac80211.h:555)
drivers/net/wireless/wl12xx/wl1251_rx.c:78:
  warning: 'qual' is deprecated (declared at include/net/mac80211.h:555)
Signed-off-by: NKalle Valo <kalle.valo@nokia.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251_rx.c

@@ -72,10 +72,6 @@ static void wl1251_rx_status(struct wl1251 *wl,
 	}
 
 	status->signal = desc->rssi;
-	status->qual = (desc->rssi - WL1251_RX_MIN_RSSI) * 100 /
-		(WL1251_RX_MAX_RSSI - WL1251_RX_MIN_RSSI);
-	status->qual = min(status->qual, 100);
-	status->qual = max(status->qual, 0);
 
 	/*
 	 * FIXME: guessing that snr needs to be divided by two, otherwise