watchdog: davinci: Add missing clk_disable_unprepare().

davinci_wdt_probe() can fail here and we must disable clock.

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

drivers/watchdog/davinci_wdt.c

···
 		return PTR_ERR(davinci_wdt->base);
 
 	ret = watchdog_register_device(wdd);
-	if (ret < 0)
+	if (ret < 0) {
+		clk_disable_unprepare(davinci_wdt->clk);
 		dev_err(dev, "cannot register watchdog device\n");
+	}
 
 	return ret;
 }