gpio-sysfs: Use gpio descriptor name instead of gpiochip names array

The name is now stored in the gpio descriptor as well, for example to
allow to store names from DT. This patch changes the sysfs gpio files
to use the gpio descriptor name.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib-sysfs.c

@@ -550,9 +550,7 @@ int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
 	struct gpiod_data	*data;
 	unsigned long		flags;
 	int			status;
-	const char		*ioname = NULL;
 	struct device		*dev;
-	int			offset;
 
 	/* can't export until sysfs is available ... */
 	if (!gpio_class.p) {
@@ -601,13 +599,9 @@ int gpiod_export(struct gpio_desc *desc, bool direction_may_change)
 	else
 		data->direction_can_change = false;
 
-	offset = gpio_chip_hwgpio(desc);
-	if (chip->names && chip->names[offset])
-		ioname = chip->names[offset];
-
 	dev = device_create_with_groups(&gpio_class, chip->dev,
 					MKDEV(0, 0), data, gpio_groups,
-					ioname ? ioname : "gpio%u",
+					desc->name ? desc->name : "gpio%u",
 					desc_to_gpio(desc));
 	if (IS_ERR(dev)) {
 		status = PTR_ERR(dev);