Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Youw

libusb/hid.c

@@ -1135,6 +1135,7 @@ static int hid_libusb_hotplug_callback(libusb_context *ctx, libusb_device *devic
 
 	struct hid_hotplug_queue* msg = calloc(1, sizeof(struct hid_hotplug_queue));
 	if (NULL == msg) {
+		libusb_unref_device(device);
 		return 0;
 	}
 
@@ -1195,8 +1196,8 @@ static void process_hotplug_event(struct hid_hotplug_queue* msg)
 				*current = (*current)->next;
 				info->next = NULL;
 				hid_internal_invoke_callbacks(info, HID_API_HOTPLUG_EVENT_DEVICE_LEFT);
-				/* Free every removed device */
-				free(info);
+				/* Free every removed device (and its internal allocations) */
+				hid_free_enumeration(info);
 			} else {
 				current = &info->next;
 			}

linux/hid.c

@@ -1276,7 +1276,7 @@ static void* hotplug_thread(void* user_data)
 							info->next = NULL;
 							hid_internal_invoke_callbacks(info, HID_API_HOTPLUG_EVENT_DEVICE_LEFT);
 							/* Free every removed device */
-							free(info);
+							hid_free_enumeration(info);
 						} else {
 							current = &info->next;
 						}

mac/hid.c

@@ -1077,7 +1077,7 @@ static void hid_internal_hotplug_disconnect_callback(void *context, IOReturn res
 			info->next = NULL;
 			hid_internal_invoke_callbacks(info, HID_API_HOTPLUG_EVENT_DEVICE_LEFT);
 			/* Free every removed device */
-			free(info);
+			hid_free_enumeration(info);
 		} else {
 			current = &info->next;
 		}

windows/hid.c

@@ -1176,7 +1176,9 @@ DWORD WINAPI hid_internal_notify_callback(HCMNOTIFICATION notify, PVOID context,
 
 		/* Free removed device */
 		if (hotplug_event == HID_API_HOTPLUG_EVENT_DEVICE_LEFT) {
-			free(device);
+			/* Ensure only this node is freed by hid_free_enumeration() */
+			device->next = NULL;
+			hid_free_enumeration(device);
 		}
 
 		/* Remove any callbacks that were marked for removal and stop the notification if none are left */