wl1251: add hw scan completed debug message

The logs currently don't show when hw scan has completed, fix that.
Signed-off-by: NKalle Valo <kalle.valo@nokia.com>
Reviewed-by: NVidhya Govindan <vidhya.govindan@nokia.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/wl12xx/wl1251_event.c

@@ -39,6 +39,7 @@ static int wl1251_event_scan_complete(struct wl1251 *wl,
 		mutex_unlock(&wl->mutex);
 		ieee80211_scan_completed(wl->hw, false);
 		mutex_lock(&wl->mutex);
+		wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
 		wl->scanning = false;
 	}