pinctrl: axp209: dereference pointer after it's been set

The number of GPIOs is gotten from a field within the structure
referenced in the of_device.data but it was actually read before it was
retrieved, thus it was dereferencing a null pointer.

Set the number of GPIOs after retrieving of_device.data.

Fixes: e1190083 ("pinctrl: axp209: add support for AXP813 GPIOs")
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Reported-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Tested-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-axp209.c

@@ -413,9 +413,11 @@ static int axp20x_pctl_probe(struct platform_device *pdev)
 	pctl->chip.set			= axp20x_gpio_set;
 	pctl->chip.direction_input	= axp20x_gpio_input;
 	pctl->chip.direction_output	= axp20x_gpio_output;
-	pctl->chip.ngpio		= pctl->desc->npins;
 
 	pctl->desc = (struct axp20x_pctrl_desc *)of_device_get_match_data(dev);
+
+	pctl->chip.ngpio		= pctl->desc->npins;
+
 	pctl->regmap = axp20x->regmap;
 	pctl->dev = &pdev->dev;