ntdll: Mac: Fix leak of send right for Mach thread port.

[Ken Thomases]

The leaked send right kept the port alive for threads that are gone.  For
processes which create a lot of threads, this can cause performance problems.

mach_thread_self() increments the reference count of the send right on the
port.  Balance that by decrementing it so that there's no net change.

Issue identified by Alexandre Julliard.
---
  dlls/ntdll/server.c |    1 +
  1 files changed, 1 insertions(+), 0 deletions(-)


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