watchdog: davinci_wdt: fix error handling in davinci_wdt_probe()

[ Upstream commit d66e5364 ]

clk_disable_unprepare() was added to one error path,
but there is another one. The patch makes sure clk is
disabled at the both of them.

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/watchdog/davinci_wdt.c

@@ -198,15 +198,22 @@ static int davinci_wdt_probe(struct platform_device *pdev)
 
 	wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	davinci_wdt->base = devm_ioremap_resource(dev, wdt_mem);
-	if (IS_ERR(davinci_wdt->base))
-		return PTR_ERR(davinci_wdt->base);
+	if (IS_ERR(davinci_wdt->base)) {
+		ret = PTR_ERR(davinci_wdt->base);
+		goto err_clk_disable;
+	}
 
 	ret = watchdog_register_device(wdd);
-	if (ret < 0) {
-		clk_disable_unprepare(davinci_wdt->clk);
+	if (ret) {
 		dev_err(dev, "cannot register watchdog device\n");
+		goto err_clk_disable;
 	}
 
+	return 0;
+
+err_clk_disable:
+	clk_disable_unprepare(davinci_wdt->clk);
+
 	return ret;
 }