gpiolib: Replace gpio_suffix_count with NULL-terminated array

There is no need to have and export the count variable for the array
in question. Instead, make it NULL-terminated.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240819142945.327808-6-andriy.shevchenko@linux.intel.comSigned-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpiolib.c

@@ -90,8 +90,7 @@ DEFINE_STATIC_SRCU(gpio_devices_srcu);
 static DEFINE_MUTEX(gpio_machine_hogs_mutex);
 static LIST_HEAD(gpio_machine_hogs);
 
-const char *const gpio_suffixes[] = { "gpios", "gpio" };
-const size_t gpio_suffix_count = ARRAY_SIZE(gpio_suffixes);
+const char *const gpio_suffixes[] = { "gpios", "gpio", NULL };
 
 static void gpiochip_free_hogs(struct gpio_chip *gc);
 static int gpiochip_add_irqchip(struct gpio_chip *gc,

drivers/gpio/gpiolib.h

@@ -89,14 +89,13 @@ static inline struct gpio_device *to_gpio_device(struct device *dev)
 	return container_of(dev, struct gpio_device, dev);
 }
 
-/* gpio suffixes used for ACPI and device tree lookup */
+/* GPIO suffixes used for ACPI and device tree lookup */
 extern const char *const gpio_suffixes[];
-extern const size_t gpio_suffix_count;
 
 #define for_each_gpio_property_name(propname, con_id)					\
-	for (unsigned int __i = 0;							\
-	     __i < gpio_suffix_count && ({						\
-		     const char *__gs = gpio_suffixes[__i];				\
+	for (const char * const *__suffixes = gpio_suffixes;				\
+	     *__suffixes && ({								\
+		const char *__gs = *__suffixes;						\
 											\
 		if (con_id)								\
 			snprintf(propname, sizeof(propname), "%s-%s", con_id, __gs);	\
@@ -104,7 +103,7 @@ extern const size_t gpio_suffix_count;
 			snprintf(propname, sizeof(propname), "%s", __gs);		\
 		1;									\
 	     });									\
-	     __i++)
+	     __suffixes++)
 
 /**
  * struct gpio_array - Opaque descriptor for a structure of GPIO array attributes