gpio: sim: use for_each_hwgpio()

Display debugfs information about all simulated GPIOs, not only the
requested ones.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-sim.c

@@ -235,10 +235,10 @@ static void gpio_sim_dbg_show(struct seq_file *seq, struct gpio_chip *gc)
 
 	guard(mutex)(&chip->lock);
 
-	for_each_requested_gpio(gc, i, label)
+	for_each_hwgpio(gc, i, label)
 		seq_printf(seq, " gpio-%-3d (%s) %s,%s\n",
 			   gc->base + i,
-			   label,
+			   label ?: "<unused>",
 			   test_bit(i, chip->direction_map) ? "input" :
 				test_bit(i, chip->value_map) ? "output-high" :
 							       "output-low",