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

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

[ Upstream commit 5cb16a24a370f29e794eabd05a56ec9b40af9658 ]

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

Fixes: 889daf95b48e ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>