staging:iio:ad7291: Use i2c_smbus_{read,write}_word_swapped instead of open-coding it

No need to swap the upper and lower byte by hand if there is a helper function
which already does this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
1 file changed