iio: adc: ad7793: remove unused int_vref_mv field
Remove unused int_vref_mv field from ad7793_state struct.
The field is declared but never accessed in the driver.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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