pinctrl: lantiq: Use kasprintf() instead of fixed buffer formatting

Improve readability and maintainability by replacing a hardcoded string
allocation and formatting by the use of the kasprintf() helper.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20190731132917.17607-3-geert+renesas@glider.beSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-falcon.c

@@ -96,12 +96,8 @@ static void lantiq_load_pin_desc(struct pinctrl_pin_desc *d, int bank, int len)
 	int i;
 
 	for (i = 0; i < len; i++) {
-		/* strlen("ioXYZ") + 1 = 6 */
-		char *name = kzalloc(6, GFP_KERNEL);
-
-		snprintf(name, 6, "io%d", base + i);
 		d[i].number = base + i;
-		d[i].name = name;
+		d[i].name = kasprintf(GFP_KERNEL, "io%d", base + i);
 	}
 	pad_count[bank] = len;
 }