can: flexcan: Switch to use dev_err_probe() helper

dev_err() can be replace with dev_err_probe() which will check if error
code is -EPROBE_DEFER.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/all/20220914134030.3782754-1-yangyingliang@huawei.comSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/flexcan/flexcan-core.c

@@ -2177,8 +2177,7 @@ static int flexcan_probe(struct platform_device *pdev)
 
 	err = flexcan_setup_stop_mode(pdev);
 	if (err < 0) {
-		if (err != -EPROBE_DEFER)
-			dev_err(&pdev->dev, "setup stop mode failed\n");
+		dev_err_probe(&pdev->dev, err, "setup stop mode failed\n");
 		goto failed_setup_stop_mode;
 	}