USB: usbtest: use URB_ZERO_PACKET for BULK-OUT transfers

Executing
| testusb -a -c 1 -t 3 -v 421 -s 2048

does not complete on the gadget side.
g_zero enqueues a 4096 bytes long buffer. The host sends 2048bytes which
is a multiple of wMaxPacketSize (either 64 or 512 bytes). The host is
done with sending data but the gadget waits for more.
Since the protocol does not include transfer-length-field sending a
terminating zero packet seems the only way out.
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/misc/usbtest.c

@@ -359,8 +359,10 @@ static int simple_io(
 	urb->context = &completion;
 	while (retval == 0 && iterations-- > 0) {
 		init_completion(&completion);
-		if (usb_pipeout(urb->pipe))
+		if (usb_pipeout(urb->pipe)) {
 			simple_fill_buf(urb);
+			urb->transfer_flags |= URB_ZERO_PACKET;
+		}
 		retval = usb_submit_urb(urb, GFP_KERNEL);
 		if (retval != 0)
 			break;