pinctrl: axp209: account for const type of of_device_id.data

The return value of of_device_get_match_data has type const void *.
The desc field of the pctl structure also has a const type, so there
is no need for the const-discarding cast between them.

Done using Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-axp209.c

@@ -414,7 +414,7 @@ static int axp20x_pctl_probe(struct platform_device *pdev)
 	pctl->chip.direction_input	= axp20x_gpio_input;
 	pctl->chip.direction_output	= axp20x_gpio_output;
 
-	pctl->desc = (struct axp20x_pctrl_desc *)of_device_get_match_data(dev);
+	pctl->desc = of_device_get_match_data(dev);
 
 	pctl->chip.ngpio		= pctl->desc->npins;