can: kvaser_pciefd: kvaser_pciefd_open(): fix error handling

If kvaser_pciefd_bus_on() failed, we should call close_candev() to avoid
reference leak.

Fixes: 26ad340e ("can: kvaser_pciefd: Add driver for Kvaser PCIEcan devices")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201128133922.3276973-3-zhangqilong3@huawei.comSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/kvaser_pciefd.c

@@ -692,8 +692,10 @@ static int kvaser_pciefd_open(struct net_device *netdev)
 		return err;
 
 	err = kvaser_pciefd_bus_on(can);
-	if (err)
+	if (err) {
+		close_candev(netdev);
 		return err;
+	}
 
 	return 0;
 }