mfd: max8925: Fix wakeup source leaks on device unbind

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

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/max8925-i2c.c

···
 	struct max8925_chip *chip = i2c_get_clientdata(client);
 
 	max8925_device_exit(chip);
+	device_init_wakeup(&client->dev, false);
 	i2c_unregister_device(chip->adc);
 	i2c_unregister_device(chip->rtc);
 }