gpio: raspberrypi-exp: mark OF related data as maybe unused
The driver can be compile tested with !CONFIG_OF making certain data unused: drivers/gpio/gpio-raspberrypi-exp.c:237:34: error: ‘rpi_exp_gpio_ids’ defined but not used [-Werror=unused-const-variable=] Signed-off-by:Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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