[PATCH] msvcrt: Handle negative file->_cnt value in _flsbuf function

[Piotr Caban]

Fixes bug 29808.

---
  dlls/msvcrt/file.c       |    2 +-
  dlls/msvcrt/tests/file.c |   15 +++++++++++++--
  2 files changed, 14 insertions(+), 3 deletions(-)


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