watchdog: sunxi_wdt: fix improper error exit code

sunxi_wdt_probe() should return -ENOMEM when devm_kzalloc() fails.

Signed-off-by: Martin Wu <wuyan@allwinnertech.com>
Signed-off-by: Frank Lee <frank@allwinnertech.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200529094514.26374-1-frank@allwinnertech.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

drivers/watchdog/sunxi_wdt.c

@@ -235,7 +235,7 @@ static int sunxi_wdt_probe(struct platform_device *pdev)
 
 	sunxi_wdt = devm_kzalloc(dev, sizeof(*sunxi_wdt), GFP_KERNEL);
 	if (!sunxi_wdt)
-		return -EINVAL;
+		return -ENOMEM;
 
 	sunxi_wdt->wdt_regs = of_device_get_match_data(dev);
 	if (!sunxi_wdt->wdt_regs)