i2c: Warn when device removing fails

The driver core ignores the return value of struct bus_type::remove. So
warn if there is an error that went unnoticed before and return 0
unconditionally in i2c_device_remove().

This prepares changing struct bus_type::remove to return void.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
[wsa: added a comment and removed unneeded initializtion]
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/i2c-core-base.c

@@ -551,15 +551,19 @@ static int i2c_device_remove(struct device *dev)
 {
 	struct i2c_client	*client = i2c_verify_client(dev);
 	struct i2c_driver	*driver;
-	int status = 0;
 
 	if (!client || !dev->driver)
 		return 0;
 
 	driver = to_i2c_driver(dev->driver);
 	if (driver->remove) {
+		int status;
+
 		dev_dbg(dev, "remove\n");
+
 		status = driver->remove(client);
+		if (status)
+			dev_warn(dev, "remove failed (%pe), will be ignored\n", ERR_PTR(status));
 	}
 
 	dev_pm_domain_detach(&client->dev, true);
@@ -571,7 +575,8 @@ static int i2c_device_remove(struct device *dev)
 	if (client->flags & I2C_CLIENT_HOST_NOTIFY)
 		pm_runtime_put(&client->adapter->dev);
 
-	return status;
+	/* return always 0 because there is WIP to make remove-functions void */
+	return 0;
 }
 
 static void i2c_device_shutdown(struct device *dev)