gpio: mockup: don't return magic numbers from probe()
When the requested number of GPIO lines is 0, return -EINVAL, not -1 which is -EPERM. Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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