usb: gadget: printer: add missing error handling

If cdev_add() in printer_bind_config() fails, care is taken to
reverse the effects of initializations completed until the fail
happens. But if printer_req_alloc() fails, it is just one of the
two lists that is cleaned up while the effects of cdev_add()
and device_create() are not reverted.

This patch changes error handling so that at least as much cleanup is done
as when a failure happens before printer_req_alloc() invocations.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/legacy/printer.c

@@ -1249,31 +1249,18 @@ static int __init printer_bind_config(struct usb_configuration *c)
 	dev->current_rx_bytes = 0;
 	dev->current_rx_buf = NULL;
 
+	status = -ENOMEM;
 	for (i = 0; i < QLEN; i++) {
 		req = printer_req_alloc(dev->in_ep, USB_BUFSIZE, GFP_KERNEL);
-		if (!req) {
-			while (!list_empty(&dev->tx_reqs)) {
-				req = container_of(dev->tx_reqs.next,
-						struct usb_request, list);
-				list_del(&req->list);
-				printer_req_free(dev->in_ep, req);
-			}
-			return -ENOMEM;
-		}
+		if (!req)
+			goto fail;
 		list_add(&req->list, &dev->tx_reqs);
 	}
 
 	for (i = 0; i < QLEN; i++) {
 		req = printer_req_alloc(dev->out_ep, USB_BUFSIZE, GFP_KERNEL);
-		if (!req) {
-			while (!list_empty(&dev->rx_reqs)) {
-				req = container_of(dev->rx_reqs.next,
-						struct usb_request, list);
-				list_del(&req->list);
-				printer_req_free(dev->out_ep, req);
-			}
-			return -ENOMEM;
-		}
+		if (!req)
+			goto fail;
 		list_add(&req->list, &dev->rx_reqs);
 	}