gpio/of: fix a typo of comment message

Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/gpio/gpiolib-of.c

@@ -21,7 +21,7 @@
 #include <linux/of_gpio.h>
 #include <linux/slab.h>
 
-/* Private data structure for of_gpiochip_is_match */
+/* Private data structure for of_gpiochip_find_and_xlate */
 struct gg_data {
 	enum of_gpio_flags *flags;
 	struct of_phandle_args gpiospec;