mtd: pismo: 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>
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/maps/pismo.c

@@ -211,13 +211,12 @@ static int pismo_remove(struct i2c_client *client)
 static int pismo_probe(struct i2c_client *client,
 		       const struct i2c_device_id *id)
 {
-	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 	struct pismo_pdata *pdata = client->dev.platform_data;
 	struct pismo_eeprom eeprom;
 	struct pismo_data *pismo;
 	int ret, i;
 
-	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "functionality mismatch\n");
 		return -EIO;
 	}