Return a more explicit error value

diff --git a/drivers/gpio.c b/drivers/gpio.c
index 0b3a8b2..1a10b4c 100644 (file)
--- a/drivers/gpio.c
+++ b/drivers/gpio.c
@@ -97,7 +97,7 @@ int set_gpio_callback(void (*callback) (uint32_t), const struct pio* gpio, uint8
        }
        /* If not found, return. */
        if (irq == NB_PININT_INTERRUPTS) {
-               return -1;
+               return -ENODEV;
        }
 
        /* Power on the Pin interrupt subsystem */