usb: gadget: f_printer: use the active RX list in soft reset

printer_soft_reset() tests rx_reqs_active in its second draining loop but retrieves the next entry from rx_buffers. If rx_reqs_active is non-empty after endpoint shutdown, this operates on the wrong list and never removes the active entry, leading to list corruption and a non-terminating loop.

Retrieve the request from the list named by the loop condition.

---
 drivers/usb/gadget/function/f_printer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 1857d78611..e3dc5d810a 100644
@@ -940,8 +940,8 @@ static void printer_soft_reset(struct printer_dev *dev)
 	}
 
 	while (likely(!(list_empty(&dev->rx_reqs_active)))) {
-		req = container_of(dev->rx_buffers.next, struct usb_request,
-				list);
+		req = list_first_entry(&dev->rx_reqs_active,
+				       struct usb_request, list);
 		list_del_init(&req->list);
 		list_add(&req->list, &dev->rx_reqs);
 	}

2.43.0