Fix a static code checker warning:
drivers/net/can/flexcan.c:1435 flexcan_setup_stop_mode() warn: passing zero to 'PTR_ERR'
Fixes: de3578c198c6 ("can: flexcan: add self wakeup support")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
        gpr_np = of_find_node_by_phandle(phandle);
        if (!gpr_np) {
                dev_dbg(&pdev->dev, "could not find gpr node by phandle\n");
-               return PTR_ERR(gpr_np);
+               return -ENODEV;
        }
 
        priv = netdev_priv(dev);