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

benpicco notifications at github.com
Wed Jul 7 18:11:21 CEST 2021

Should the other instances of `miso_pin` etc be guarded as well?
e.g. if a MOSI only (no MISO) SPI is configured for e.g. a serial LED

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