Convert unlink_internals to use delete_on_close?

[Volker Lendecke]

Hi, Jeremy!

Right now I'm trying to streamline unlink_internals a bit.
One way to do it correctly and a bit less racy would be to
got through the full ntcreate, set_delete_on_close, close
cycle.

Speed-wise it should not make too much of a difference
because in can_delete we go through ntcreate/close anyway.
A necessary change would be to have close_file() actually
return NTSTATUS (Hey, we have to take care of the return
status of close(2) ;-)) to correctly report
NT_STATUS_ACCESS_DENIED for example.

What do you think? It potentially removes some of the code
in reply.c.

Volker
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