ntdll: Don't modify LockCount in RtlLeaveCriticalSection if section is not acquired.

[Jacek Caban]

v2: Using importlib for Rtl* functions and fixes spotted by Sebastian.

Signed-off-by: Jacek Caban <jacek at codeweavers.com>
---
 dlls/ntdll/critsection.c |  6 ++++-
 dlls/ntdll/tests/rtl.c   | 60
++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 1 deletion(-)


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