IN  PDEVICE_OBJECT DeviceContext,
  IN  PIRP pIrp

Routine Description:

    This routine handles the cancelling a FindName Irp - which has
    been passed down by a client (e.g. ping).  Typically, when ping succeeds
    on another adapter, it will issue this cancel.
    On receiving the cancel, we stop any timer that is running in connection
    with name query and then complete the irp with status_cancelled.


Return Value:

    The final status from the operation.