watchdog: rti-wdt: fix reference leak in rti_wdt_probe

pm_runtime_get_sync() will increment pm usage counter even it
failed. Forgetting to call pm_runtime_put_noidle will result
in reference leak in rti_wdt_probe, so we should fix it.
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20201030154909.100023-1-zhangqilong3@huawei.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/rti_wdt.c

@@ -227,8 +227,10 @@ static int rti_wdt_probe(struct platform_device *pdev)
 
 	pm_runtime_enable(dev);
 	ret = pm_runtime_get_sync(dev);
-	if (ret)
+	if (ret) {
+		pm_runtime_put_noidle(dev);
 		return dev_err_probe(dev, ret, "runtime pm failed\n");
+	}
 
 	platform_set_drvdata(pdev, wdt);