[PATCH] I2C: pcf8574 driver cleanup

I found a possible cleanup in the pcf8574 driver. We don't need to store
the read value in our private data structure, as we then never use it
again. I asked Aurelien and he is fine with the change. Please apply,
thanks.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/i2c/chips/pcf8574.c

@@ -57,7 +57,7 @@ SENSORS_INSMOD_2(pcf8574, pcf8574a);
 struct pcf8574_data {
 	struct i2c_client client;
 
-	u8 read, write;			/* Register values */
+	u8 write;			/* Remember last written value */
 };
 
 static int pcf8574_attach_adapter(struct i2c_adapter *adapter);
@@ -79,9 +79,7 @@ static struct i2c_driver pcf8574_driver = {
 static ssize_t show_read(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct i2c_client *client = to_i2c_client(dev);
-	struct pcf8574_data *data = i2c_get_clientdata(client);
-	data->read = i2c_smbus_read_byte(client); 
-	return sprintf(buf, "%u\n", data->read);
+	return sprintf(buf, "%u\n", i2c_smbus_read_byte(client));
 }
 
 static DEVICE_ATTR(read, S_IRUGO, show_read, NULL);