platform/chrome: cros_ec: Make cros_ec_unregister() return void

Up to now cros_ec_unregister() returns zero unconditionally. Make it
return void instead which makes it easier to see in the callers that
there is no error to handle.

Also the return value of i2c, platform and spi remove callbacks is
ignored anyway.

Reviewed-by: Guenter Roeck <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Uwe Kleine-König <[e-mail]>
Acked-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/platform/chrome/cros_ec.c

···
  *
  * Return: 0 on success or negative error code.
  */
-int cros_ec_unregister(struct cros_ec_device *ec_dev)
+void cros_ec_unregister(struct cros_ec_device *ec_dev)
 {
 	if (ec_dev->pd)
 		platform_device_unregister(ec_dev->pd);
 	platform_device_unregister(ec_dev->ec);
-
-	return 0;
 }
 EXPORT_SYMBOL(cros_ec_unregister);
 

drivers/platform/chrome/cros_ec.h

···
 #include <linux/interrupt.h>
 
 int cros_ec_register(struct cros_ec_device *ec_dev);
-int cros_ec_unregister(struct cros_ec_device *ec_dev);
+void cros_ec_unregister(struct cros_ec_device *ec_dev);
 
 int cros_ec_suspend(struct cros_ec_device *ec_dev);
 int cros_ec_resume(struct cros_ec_device *ec_dev);

drivers/platform/chrome/cros_ec_i2c.c

···
 {
 	struct cros_ec_device *ec_dev = i2c_get_clientdata(client);
 
-	return cros_ec_unregister(ec_dev);
+	cros_ec_unregister(ec_dev);
+
+	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP

drivers/platform/chrome/cros_ec_lpc.c

···
 		acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
 					   cros_ec_lpc_acpi_notify);
 
-	return cros_ec_unregister(ec_dev);
+	cros_ec_unregister(ec_dev);
+
+	return 0;
 }
 
 static const struct acpi_device_id cros_ec_lpc_acpi_device_ids[] = {

drivers/platform/chrome/cros_ec_spi.c

···
 {
 	struct cros_ec_device *ec_dev = spi_get_drvdata(spi);
 
-	return cros_ec_unregister(ec_dev);
+	cros_ec_unregister(ec_dev);
+
+	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP