gpiolib: Unify expectations about ->request() returned value
Half of the code in the GPIO library is written in an expectation that any non-zero value returned from the ->request() callback is an error code, while some code checks only for negative values. Unify expectations about ->request() returned value to be non-zero for an error and 0 for the success. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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