pinctrl: baytrail: use gpiochip_dup_line_label()

Use the new gpiochip_dup_line_label() helper to safely retrieve the
descriptor label.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/intel/pinctrl-baytrail.c

@@ -9,6 +9,7 @@
 #include <linux/acpi.h>
 #include <linux/array_size.h>
 #include <linux/bitops.h>
+#include <linux/cleanup.h>
 #include <linux/gpio/driver.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
@@ -1173,7 +1174,6 @@ static void byt_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 		const char *pull_str = NULL;
 		const char *pull = NULL;
 		unsigned long flags;
-		const char *label;
 		unsigned int pin;
 
 		pin = vg->soc->pins[i].number;
@@ -1200,9 +1200,10 @@ static void byt_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 			seq_printf(s, "Pin %i: can't retrieve community\n", pin);
 			continue;
 		}
-		label = gpiochip_is_requested(chip, i);
-		if (!label)
-			label = "Unrequested";
+
+		char *label __free(kfree) = gpiochip_dup_line_label(chip, i);
+		if (IS_ERR(label))
+			continue;
 
 		switch (conf0 & BYT_PULL_ASSIGN_MASK) {
 		case BYT_PULL_ASSIGN_UP:
@@ -1231,7 +1232,7 @@ static void byt_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 		seq_printf(s,
 			   " gpio-%-3d (%-20.20s) %s %s %s pad-%-3d offset:0x%03x mux:%d %s%s%s",
 			   pin,
-			   label,
+			   label ?: "Unrequested",
 			   val & BYT_INPUT_EN ? "  " : "in",
 			   val & BYT_OUTPUT_EN ? "   " : "out",
 			   str_hi_lo(val & BYT_LEVEL),