i2c: mux: pca954x: make use of __i2c_smbus_xfer

This simplifies the code, and you get retries for free if the adapter
does not support ->master_xfer.
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/muxes/i2c-mux-pca954x.c

@@ -220,30 +220,11 @@ MODULE_DEVICE_TABLE(of, pca954x_of_match);
 static int pca954x_reg_write(struct i2c_adapter *adap,
 			     struct i2c_client *client, u8 val)
 {
-	int ret = -ENODEV;
-
-	if (adap->algo->master_xfer) {
-		struct i2c_msg msg;
-		char buf[1];
-
-		msg.addr = client->addr;
-		msg.flags = 0;
-		msg.len = 1;
-		buf[0] = val;
-		msg.buf = buf;
-		ret = __i2c_transfer(adap, &msg, 1);
-
-		if (ret >= 0 && ret != 1)
-			ret = -EREMOTEIO;
-	} else {
-		union i2c_smbus_data data;
-		ret = adap->algo->smbus_xfer(adap, client->addr,
-					     client->flags,
-					     I2C_SMBUS_WRITE,
-					     val, I2C_SMBUS_BYTE, &data);
-	}
+	union i2c_smbus_data dummy;
 
-	return ret;
+	return __i2c_smbus_xfer(adap, client->addr, client->flags,
+				I2C_SMBUS_WRITE, val,
+				I2C_SMBUS_BYTE, &dummy);
 }
 
 static int pca954x_select_chan(struct i2c_mux_core *muxc, u32 chan)