gpio: of: Remove unneeded dummy function

of_find_gpio() is always called under an IS_ENABLED(CONFIG_OF), so the
dummy implementation provided for !OF configurations is not needed.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -2596,7 +2596,6 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
 	mutex_unlock(&gpio_lookup_lock);
 }
 
-#ifdef CONFIG_OF
 static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 				      unsigned int idx,
 				      enum gpio_lookup_flags *flags)
@@ -2621,14 +2620,6 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 
 	return desc;
 }
-#else
-static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
-				      unsigned int idx,
-				      enum gpio_lookup_flags *flags)
-{
-	return ERR_PTR(-ENODEV);
-}
-#endif
 
 static struct gpio_desc *acpi_find_gpio(struct device *dev, const char *con_id,
 					unsigned int idx,