watchdog: starfive: Add missing clk_disable_unprepare()

Add the missing clk_disable_unprepare() before return in
starfive_wdt_enable_clock().

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Reviewed-by: Xingyu Wu <xingyu.wu@starfivetech.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20240628033508.281058-1-nichen@iscas.ac.cn
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: Chen Ni

drivers/watchdog/starfive-wdt.c

@@ -152,8 +152,10 @@ static int starfive_wdt_enable_clock(struct starfive_wdt *wdt)
 		return dev_err_probe(wdt->wdd.parent, ret, "failed to enable apb clock\n");
 
 	ret = clk_prepare_enable(wdt->core_clk);
-	if (ret)
+	if (ret) {
+		clk_disable_unprepare(wdt->apb_clk);
 		return dev_err_probe(wdt->wdd.parent, ret, "failed to enable core clock\n");
+	}
 
 	return 0;
 }