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>