can: dev: can_bus_off(): print scheduling of restart if activated

If a CAN device goes into bus-off and has automatic restart enabled, inform
user that a automatic restart is scheduled after the configured delay.

Link: https://lore.kernel.org/r/20200915223527.1417033-14-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/dev.c

@@ -639,6 +639,10 @@ void can_bus_off(struct net_device *dev)
 {
 	struct can_priv *priv = netdev_priv(dev);
 
+	if (priv->restart_ms)
+		netdev_info(dev, "bus-off, scheduling restart in %d ms\n",
+			    priv->restart_ms);
+	else
 		netdev_info(dev, "bus-off\n");
 
 	netif_carrier_off(dev);