gpiolib: Fix docs for gpiochip_add_pingroup_range

gpiochip_add_pingroup_range() has a pctldev argument, not pinctrl.

Signed-off-by: Tomeu Vizoso <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>

drivers/gpio/gpiolib.c

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 /**
  * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping
  * @chip: the gpiochip to add the range for
- * @pinctrl: the dev_name() of the pin controller to map to
+ * @pctldev: the pin controller to map to
  * @gpio_offset: the start offset in the current gpio_chip number space
  * @pin_group: name of the pin group inside the pin controller
  */