iio: adc: at91-sama5d2_adc: check return status for pressure and touch

Check return status of at91_adc_read_position() and
at91_adc_read_pressure() in at91_adc_read_info_raw().

Fixes: 6794e23f ("iio: adc: at91-sama5d2_adc: add support for oversampling resolution")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220803102855.2191070-3-claudiu.beznea@microchip.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>