IN  PDEVICE_OBJECT DeviceContext,
  IN  PIRP pIrp

Routine Description:

    This routine handles the cancelling a Disconnect Wait Irp - which has
    been passed down by a client so that when a disconnect occurs this
    irp will complete and inform the client.  The action here is to simply
    complete the irp with status cancelled.
    down to NBT from Lmhsvc, for the purpose of resolving a name with DNS.
    Nbt will complete this irp each time it has a name to resolve with DNS.

    This routine will get the Resource Lock, and Null the Irp ptr in the
    DnsQueries structure and then return the irp.


Return Value:

    The final status from the operation.