Change Invalid Handle fom CreateEvent to INVALID_HANDLE_VALUE

Here is patch which address edge case handling,
  - CreateEvent return NULL as invalid handle, this would be used in
CloseHandle as potentionaly correct handle, so fix it to
INVALID_HANDLE_VALUE
  - in same case CloseHandle for m_hEvent whould be called with NULL (or
INVALID_HANDLE_VALUE with this fix) handler

-- 
Oto BREZINA, Printflow s.r.o.
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