ntdll: Resend 4/4 NtCreateMailslotFile tests

[Jeff Latimer]

Test values around the Object_Attributes and add tests for NULLs in file.c.

Jeff Latimer

---
   dlls/ntdll/file.c           |    4 ++++
   dlls/ntdll/tests/mailslot.c |   32 ++++++++++++++++++++++++++++++++
   2 files changed, 36 insertions(+), 0 deletions(-)

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