can: c_can: free_c_can_dev(): add missing netif_napi_del()

This patch adds the missing netif_napi_del() to the free_c_can_dev() function.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/c_can/c_can.c

@@ -1269,6 +1269,9 @@ EXPORT_SYMBOL_GPL(c_can_power_up);
 
 void free_c_can_dev(struct net_device *dev)
 {
+	struct c_can_priv *priv = netdev_priv(dev);
+
+	netif_napi_del(&priv->napi);
 	free_candev(dev);
 }
 EXPORT_SYMBOL_GPL(free_c_can_dev);