gpio: fix documentation for gpiod_unexport

Both gpio_export and gpio_free APIs are obsolete now.

Signed-off-by: Amitesh Singh <singh.amitesh@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 932e510a..4b44dd9 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -670,10 +670,10 @@
 EXPORT_SYMBOL_GPL(gpiod_export_link);
 
 /**
- * gpiod_unexport - reverse effect of gpio_export()
+ * gpiod_unexport - reverse effect of gpiod_export()
  * @gpio: gpio to make unavailable
  *
- * This is implicit on gpio_free().
+ * This is implicit on gpiod_free().
  */
 void gpiod_unexport(struct gpio_desc *desc)
 {