pinctrl: abx500: Use seq_putc() in abx500_gpio_dbg_show()

A single character (line break) should be put into a sequence.
Thus use the corresponding function "seq_putc".

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/nomadik/pinctrl-abx500.c

@@ -633,7 +633,7 @@ static void abx500_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 	for (i = 0; i < chip->ngpio; i++, gpio++) {
 		/* On AB8500, there is no GPIO0, the first is the GPIO 1 */
 		abx500_gpio_dbg_show_one(s, pctldev, chip, i + 1, gpio);
-		seq_printf(s, "\n");
+		seq_putc(s, '\n');
 	}
 }