[riot-notifications] [RIOT-OS/RIOT] stm32/spi : Add check for GPIO_UNDEF (#16625)

Francisco notifications at github.com
Wed Jul 7 18:30:58 CEST 2021

@fjmolinas requested changes on this pull request.

I  think it's simpler to just return when initializing pins when using SUBGHZ spi, in other cases I would rather have an error.

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