iio:adc:qcom-spmi-vadc silence a long constant warning.

It is meant to be long and is only added to an s64.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: Rama Krishna Phani A <rphani@codeaurora.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
1 file changed