staging:iio:ad7887: Use passed in chan spec in ad7887_read_raw
Use the passed in chan spec in ad7887_read_raw instead of alawys using the first chan spec entry from the chip info data. Since all channels have the same shift and realbits from a functional point of view it does not matter which chan spec is used, but the patch makes the a bit more clear. Signed-off-by: NLars-Peter Clausen <lars@metafoo.de> Signed-off-by: NJonathan Cameron <jic23@kernel.org>
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