iio: dac: ti-dac5571: remove unused id field
Remove unused id field from dac5571_data 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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