webrtcbin: WebRTCTransceiver.mline initial value not equal -1

In webrtcbin source code we have next line trans = _create_webrtc_transceiver (webrtc, direction, -1);. The third argument in this function is an "mline" of type guint. In this situation we have unreachable code in next function

static gboolean
_find_compatible_unassociated_transceiver (GstWebRTCRTPTransceiver * p1,
    gconstpointer data)
{
  if (p1->mid)
    return FALSE;
  if (p1->mline != -1)
    return FALSE;
  if (p1->stopped)
    return FALSE;

  return TRUE;
}