pinctrl: rockchip: Improve a size determination in rockchip_pinctrl_probe()

Replace the specification of a data structure by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer according to the Linux coding style convention.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-rockchip.c

@@ -3166,7 +3166,7 @@ static int rockchip_pinctrl_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	info = devm_kzalloc(dev, sizeof(struct rockchip_pinctrl), GFP_KERNEL);
+	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;