gpio: Fix GPIO_DT_SPEC_INST_GET_BY_IDX_OR macro

Fixes the macro for getting the instance of a device tree GPIO
with index or default value.

Signed-off-by: Jamie McCrae <[email protected]>

Author: thedjnK

include/zephyr/drivers/gpio.h

@@ -388,8 +388,10 @@ struct gpio_dt_spec {
  * @return static initializer for a struct gpio_dt_spec for the property
  * @see GPIO_DT_SPEC_GET_BY_IDX()
  */
-#define GPIO_DT_SPEC_INST_GET_BY_IDX_OR(inst, prop, idx, default_value)	\
-	GPIO_DT_SPEC_GET_BY_IDX_OR(DT_DRV_INST(inst), prop, idx, default_value)
+#define GPIO_DT_SPEC_INST_GET_BY_IDX_OR(inst, prop, idx, default_value)		\
+	COND_CODE_1(DT_PROP_HAS_IDX(DT_DRV_INST(inst), prop, idx),		\
+		    (GPIO_DT_SPEC_GET_BY_IDX(DT_DRV_INST(inst), prop, idx)),	\
+		    (default_value))
 
 /**
  * @brief Equivalent to GPIO_DT_SPEC_INST_GET_BY_IDX(inst, prop, 0).