staging: iio: adc: ad7192: fail probe on get_voltage

This patch makes the ad7192_probe fail in case
regulator_get_voltage will return an error or voltage
is set to 0.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
1 file changed