can: gs_usb: gs_usb_receive_bulk_callback(): make use of stats

Make use the previously assigned variable stats instead of using
netdev->stats.

Link: https://lore.kernel.org/all/20230718-gs_usb-cleanups-v1-6-c3b9154ec605@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/gs_usb.c

@@ -594,8 +594,8 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
 
 		gs_usb_set_timestamp(dev, skb, hf);
 
-		netdev->stats.rx_packets++;
-		netdev->stats.rx_bytes += hf->can_dlc;
+		stats->rx_packets++;
+		stats->rx_bytes += hf->can_dlc;
 
 		netif_rx(skb);
 	} else { /* echo_id == hf->echo_id */
@@ -619,8 +619,8 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
 		skb = dev->can.echo_skb[hf->echo_id];
 		gs_usb_set_timestamp(dev, skb, hf);
 
-		netdev->stats.tx_packets++;
-		netdev->stats.tx_bytes += can_get_echo_skb(netdev, hf->echo_id,
+		stats->tx_packets++;
+		stats->tx_bytes += can_get_echo_skb(netdev, hf->echo_id,
 						    NULL);
 
 		gs_free_tx_context(txc);