iio:adc:ingenic: drop of_match_ptr protection and include mod_devicetable.h
Whilst it's unlikely this device will ever be instantiated using ACPI, there is little advantage not assigning the of_device_id table in all cases and it avoids providing an example that might be coppied into new drivers. Also include mod_devicetable.h whilst here as of_device_id is defined in there so including the header is best practice. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Artur Rojek <contact@artur-rojek.eu> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
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