usb: xhci: improve error message for targetless transfer event

Improve error message for unknown transfer event without a TRB, by also
printing the event code number. This removes the inevitable question;
"what was the unknown event code exactly?"
Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20240626124835.1023046-13-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-ring.c

@@ -2582,8 +2582,8 @@ static int handle_transferless_tx_event(struct xhci_hcd *xhci, struct xhci_virt_
 	case COMP_STOPPED_LENGTH_INVALID:
 		break;
 	default:
-		xhci_err(xhci, "ERROR Transfer event for unknown stream ring slot %u ep %u\n",
-			 ep->vdev->slot_id, ep->ep_index);
+		xhci_err(xhci, "Transfer event %u for unknown stream ring slot %u ep %u\n",
+			 trb_comp_code, ep->vdev->slot_id, ep->ep_index);
 		return -ENODEV;
 	}
 	return 0;