iio: light: isl29501: Simplify code to kill compiler warning

With gcc 4.1.2:

    drivers/iio/proximity/isl29501.c: In function ‘isl29501_register_write’:
    drivers/iio/proximity/isl29501.c:235: warning: ‘msb’ may be used uninitialized in this function

While this is a false positive, it can easily be avoided by removing the
"msb" intermediate variable.
Remove the "lsb" intermediate variable for consistency.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/proximity/isl29501.c

@@ -232,7 +232,6 @@ static u32 isl29501_register_write(struct isl29501_private *isl29501,
 				   u32 value)
 {
 	const struct isl29501_register_desc *reg = &isl29501_registers[name];
-	u8 msb, lsb;
 	int ret;
 
 	if (!reg->msb && value > U8_MAX)
@@ -241,22 +240,15 @@ static u32 isl29501_register_write(struct isl29501_private *isl29501,
 	if (value > U16_MAX)
 		return -ERANGE;
 
-	if (!reg->msb) {
-		lsb = value & 0xFF;
-	} else {
-		msb = (value >> 8) & 0xFF;
-		lsb = value & 0xFF;
-	}
-
 	mutex_lock(&isl29501->lock);
 	if (reg->msb) {
 		ret = i2c_smbus_write_byte_data(isl29501->client,
-						reg->msb, msb);
+						reg->msb, value >> 8);
 		if (ret < 0)
 			goto err;
 	}
 
-	ret = i2c_smbus_write_byte_data(isl29501->client, reg->lsb, lsb);
+	ret = i2c_smbus_write_byte_data(isl29501->client, reg->lsb, value);
 
 err:
 	mutex_unlock(&isl29501->lock);