USB: usbip: clean up mixed use of _irq() and _irqsave()

It generally doesn't make sense to use _irq() and _irqsave() in the same
function because either some of the callers have disabled IRQs or they
haven't. In this case, the v_recv_cmd_submit() appears to always be
called with IRQs enabled so the code works fine. That means I could
convert it to either _irq() or _irqsave() but I chose to use _irqsave()
because it's more conservative and easier to review.

Reviewed-by: Shuah Khan <[e-mail]>
Signed-off-by: Dan Carpenter <[e-mail]>
Link: https://lore.kernel.org/r/Yo4gqLPtHO6XKMLn@kili
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/usbip/vudc_rx.c

···
 	if (pdu->base.direction == USBIP_DIR_IN)
 		address |= USB_DIR_IN;
 
-	spin_lock_irq(&udc->lock);
+	spin_lock_irqsave(&udc->lock, flags);
 	urb_p->ep = vudc_find_endpoint(udc, address);
 	if (!urb_p->ep) {
 		/* we don't know the type, there may be isoc data! */
 		dev_err(&udc->pdev->dev, "request to nonexistent endpoint");
-		spin_unlock_irq(&udc->lock);
+		spin_unlock_irqrestore(&udc->lock, flags);
 		usbip_event_add(&udc->ud, VUDC_EVENT_ERROR_TCP);
 		ret = -EPIPE;
 		goto free_urbp;
 	}
 	urb_p->type = urb_p->ep->type;
-	spin_unlock_irq(&udc->lock);
+	spin_unlock_irqrestore(&udc->lock, flags);
 
 	urb_p->new = 1;
 	urb_p->seqnum = pdu->base.seqnum;