ASoC: codecs: max98390: 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>
Link: https://lore.kernel.org/r/20210918213553.14514-2-wsa+renesas@sang-engineering.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/max98390.c

@@ -1021,7 +1021,7 @@ static int max98390_i2c_probe(struct i2c_client *i2c,
 	int reg = 0;
 
 	struct max98390_priv *max98390 = NULL;
-	struct i2c_adapter *adapter = to_i2c_adapter(i2c->dev.parent);
+	struct i2c_adapter *adapter = i2c->adapter;
 
 	ret = i2c_check_functionality(adapter,
 		I2C_FUNC_SMBUS_BYTE