wl1271: use ieee80211_rx_ni()

Use the new ieee80211_rx_ni() function instead of ieee80211_rx().  Since we
use a workqueue to handle the RX path, we need to call the new function,
which disables bottom half handling.  This patch fixes the NOHZ:
local_softirq_pending messages.

CC: Kalle Valo <kalle.valo@nokia.com>
Signed-off-by: NLuciano Coelho <luciano.coelho@nokia.com>
Reviewed-by: NKalle Valo <kalle.valo@nokia.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1271_rx.c

@@ -184,7 +184,7 @@ static void wl1271_rx_handle_data(struct wl1271 *wl, u32 length)
 		     beacon ? "beacon" : "");
 
 	memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status));
-	ieee80211_rx(wl->hw, skb);
+	ieee80211_rx_ni(wl->hw, skb);
 }
 
 void wl1271_rx(struct wl1271 *wl, struct wl1271_fw_status *status)