[PATCH 4/4] ntdll: Set IO_STATUS_BLOCK on non-blocking NtFlushBuffersFile success.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek(a)codeweavers.com>
---

I wouldn't add iosb check (esp. virtual_check_buffer_for_write one), but
we already have tests that would crash otherwise. Although I could use
__TRY/__EXCEPT when setting those values, technically we should probably
still check that in blocking case (and fail early, like in the patch).

 dlls/ntdll/file.c       | 21 ++++++++++++++-------
 dlls/ntdll/tests/file.c |  2 --
 dlls/ntdll/tests/pipe.c |  2 +-
 3 files changed, 15 insertions(+), 10 deletions(-)