iio: light: noa1305: Assign val in noa1305_measure()

Make noa1305_measure() behave similar to noa1305_scale(), make it
assign the 'val' output variable on success and return IIO_VAL_INT.
This further simplifies noa1305_read_raw() and allows removal of
ret variable altogether.

Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://patch.msgid.link/20240715183120.143417-2-marex@denx.de


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>