[PATCH v2] iio: adc: imx8qxp-adc: propagate regulator_get_voltage error

[Fabio Estevam]

Hi Martin,

On Wed, Jul 20, 2022 at 12:31 PM Martin Larsson <martin.larsson at actia.se> wrote:
>
> If the ADC vref regulator returns an error, for example, if CONFIG_REGULATOR
> is not set, the error will be used as a reference voltage.
>
> Introduce a guard for negative return values instead of unconditionally
> casting it to u32.
>
> Acked-by: Haibo Chen <haibo.chen at nxp.com>
> Signed-off-by: Martin Larsson <martin.larsson at actia.se>

Reviewed-by: Fabio Estevam <festevam at gmail.com>