mfd: sprd-sc27xx: 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]>
Reviewed-by: Baolin Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/sprd-sc27xx-spi.c

···
 		return ret;
 	}
 
-	device_init_wakeup(&spi->dev, true);
+	ret = devm_device_init_wakeup(&spi->dev);
+	if (ret)
+		return dev_err_probe(&spi->dev, ret, "Failed to init wakeup\n");
+
 	return 0;
 }