i2c: Keep client->driver and client->dev.driver in sync

Ensure that client->driver is set to NULL if the probe() returns an
error (this keeps client->driver and client->dev.driver in sync).

Signed-off-by: Hans Verkuil <[e-mail]>
Acked-by: David Brownell <[e-mail]>
Signed-off-by: Jean Delvare <[e-mail]>

drivers/i2c/i2c-core.c

···
 {
 	struct i2c_client	*client = to_i2c_client(dev);
 	struct i2c_driver	*driver = to_i2c_driver(dev->driver);
+	int status;
 
 	if (!driver->probe)
 		return -ENODEV;
 	client->driver = driver;
 	dev_dbg(dev, "probe\n");
-	return driver->probe(client);
+	status = driver->probe(client);
+	if (status)
+		client->driver = NULL;
+	return status;
 }
 
 static int i2c_device_remove(struct device *dev)