gpio: add missing static inline

of_get_named_gpiod_flags() was missing a static inline version
when compiling without OF_GPIO. Add this.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 82a91aa..346fbda 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -92,6 +92,8 @@
 			       const char *con_id,
 			       unsigned int idx,
 			       enum gpio_lookup_flags *flags);
+struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+		   const char *list_name, int index, enum of_gpio_flags *flags);
 int of_gpiochip_add(struct gpio_chip *gc);
 void of_gpiochip_remove(struct gpio_chip *gc);
 #else
@@ -102,6 +104,11 @@
 {
 	return ERR_PTR(-ENOENT);
 }
+static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
+		   const char *list_name, int index, enum of_gpio_flags *flags)
+{
+	return ERR_PTR(-ENOENT);
+}
 static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; }
 static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
 #endif /* CONFIG_OF_GPIO */
@@ -160,9 +167,6 @@
 }
 #endif
 
-struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
-		   const char *list_name, int index, enum of_gpio_flags *flags);
-
 struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
 void gpiod_set_array_value_complex(bool raw, bool can_sleep,
 				   unsigned int array_size,