leds: leds-tca6507: simplify getting the adapter of a client

We have a dedicated pointer for that, so use it. Much easier to read and
less computation involved.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>

drivers/leds/leds-tca6507.c

@@ -757,7 +757,7 @@ static int tca6507_probe(struct i2c_client *client,
 	int err;
 	int i = 0;
 
-	adapter = to_i2c_adapter(client->dev.parent);
+	adapter = client->adapter;
 	pdata = dev_get_platdata(&client->dev);
 
 	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))