orinoco: Clear dangling pointer on hardware busy

On hardware busy the scan request pointer should be cleared, as higher
levels will release. This avoids a crash when that pointer is
erroneously used later.
Signed-off-by: NJoseph J. Gunn <armadefuego@yahoo.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/orinoco/cfg.c

@@ -153,6 +153,9 @@ static int orinoco_scan(struct wiphy *wiphy, struct net_device *dev,
 	priv->scan_request = request;
 
 	err = orinoco_hw_trigger_scan(priv, request->ssids);
+	/* On error the we aren't processing the request */
+	if (err)
+		priv->scan_request = NULL;
 
 	return err;
 }