gpio: of: Spelling: s/retures/returns/

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpiolib-of.c

···
  *
  * This is only used by of_gpiochip_add to request/set GPIO initial
  * configuration.
- * It retures error if it fails otherwise 0 on success.
+ * It returns error if it fails otherwise 0 on success.
  */
 static int of_gpiochip_scan_gpios(struct gpio_chip *chip)
 {