gpio: sim: lock hog configfs items if present

Depending on the user config, the leaf entry may be the hog directory,
not line. Check it and lock the correct item.

Fixes: 8bd76b3 ("gpio: sim: lock up configfs that an instantiated device depends on")
Tested-by: Koichiro Den <koichiro.den@canonical.com>
Link: https://lore.kernel.org/r/20250203110123.87701-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Bartosz Golaszewski

drivers/gpio/gpio-sim.c

@@ -1028,20 +1028,23 @@ gpio_sim_device_lockup_configfs(struct gpio_sim_device *dev, bool lock)
 	struct configfs_subsystem *subsys = dev->group.cg_subsys;
 	struct gpio_sim_bank *bank;
 	struct gpio_sim_line *line;
+	struct config_item *item;
 
 	/*
-	 * The device only needs to depend on leaf line entries. This is
+	 * The device only needs to depend on leaf entries. This is
 	 * sufficient to lock up all the configfs entries that the
 	 * instantiated, alive device depends on.
 	 */
 	list_for_each_entry(bank, &dev->bank_list, siblings) {
 		list_for_each_entry(line, &bank->line_list, siblings) {
+			item = line->hog ? &line->hog->item
+					 : &line->group.cg_item;
+
 			if (lock)
-				WARN_ON(configfs_depend_item_unlocked(
-						subsys, &line->group.cg_item));
+				WARN_ON(configfs_depend_item_unlocked(subsys,
+								      item));
 			else
-				configfs_undepend_item_unlocked(
-						&line->group.cg_item);
+				configfs_undepend_item_unlocked(item);
 		}
 	}
 }