watchdog: stm32: Fix wakeup source leaks on device unbind

Device can be unbound or probe can fail, so driver must also release
memory for the wakeup source.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250406203531.61322-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: krzk

drivers/watchdog/stm32_iwdg.c

@@ -291,7 +291,7 @@ static int stm32_iwdg_irq_init(struct platform_device *pdev,
 		return 0;
 
 	if (of_property_read_bool(np, "wakeup-source")) {
-		ret = device_init_wakeup(dev, true);
+		ret = devm_device_init_wakeup(dev);
 		if (ret)
 			return ret;