rtc: goldfish: Use correct return value for goldfish_rtc_probe()

When call function devm_platform_ioremap_resource(), we should use IS_ERR()
to check the return value and return PTR_ERR() if failed.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/1590370788-15136-1-git-send-email-yangtiezhu@loongson.cn

drivers/rtc/rtc-goldfish.c

@@ -174,7 +174,7 @@ static int goldfish_rtc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, rtcdrv);
 	rtcdrv->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(rtcdrv->base))
-		return -ENODEV;
+		return PTR_ERR(rtcdrv->base);
 
 	rtcdrv->irq = platform_get_irq(pdev, 0);
 	if (rtcdrv->irq < 0)