kernel32: Use default buffer size in CreatePipe if 0 was passed.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek at codeweavers.com>
---
  dlls/kernel32/sync.c       |  2 ++
  dlls/kernel32/tests/pipe.c | 37 +++++++++++++++++++++++--------------
  2 files changed, 25 insertions(+), 14 deletions(-)


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