Resend 2/4 NtCreateMailslotFile tests

[Jeff Latimer]

Check for passing a NULL handle and add a test.

Jeff Latimer

---
  dlls/kernel32/tests/mailslot.c |   11 ++++++++++-
  dlls/ntdll/file.c              |    2 ++
  2 files changed, 12 insertions(+), 1 deletions(-)
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