watchdog: imx2_wdt: Disable previously acquired clock on error path

If watchdog_register_device() fails we should disable the previously
acquired wdev->clk clock on error path.

Signed-off-by: Fabio Estevam <[e-mail]>
Reviewed-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/imx2_wdt.c

···
 	ret = watchdog_register_device(wdog);
 	if (ret) {
 		dev_err(&pdev->dev, "cannot register watchdog device\n");
-		return ret;
+		goto disable_clk;
 	}
 
 	wdev->restart_handler.notifier_call = imx2_restart_handler;
···
 		 wdog->timeout, nowayout);
 
 	return 0;
+
+disable_clk:
+	clk_disable_unprepare(wdev->clk);
+	return ret;
 }
 
 static int __exit imx2_wdt_remove(struct platform_device *pdev)