pinctrl: xway: Use devm_kasprintf() instead of fixed buffer formatting

Improve readability and maintainability by replacing a hardcoded string
allocation and formatting by the use of the devm_kasprintf() helper.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20190731132917.17607-4-geert+renesas@glider.beSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-xway.c

@@ -1731,13 +1731,11 @@ static int pinmux_xway_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	for (i = 0; i < xway_chip.ngpio; i++) {
-		/* strlen("ioXY") + 1 = 5 */
-		char *name = devm_kzalloc(&pdev->dev, 5, GFP_KERNEL);
+		char *name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "io%d", i);
 
 		if (!name)
 			return -ENOMEM;
 
-		snprintf(name, 5, "io%d", i);
 		xway_info.pads[i].number = GPIO0 + i;
 		xway_info.pads[i].name = name;
 	}