Close handles properly

Change-Id: If8620229d41ae9b6c0a1714967a8bb6d51d3ba0d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/179939
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Jenkins

setup_native/source/win32/customactions/reg_dlls/reg_dlls.cxx

@@ -168,6 +168,7 @@ void RegDLL(MSIHANDLE hInst, const std::wstring& sArgs, bool bUnreg)
         if (!CreateProcessW(sRegSvr32.c_str(), const_cast<LPWSTR>(sCmd.c_str()), nullptr, nullptr,
                             FALSE, CREATE_NO_WINDOW, nullptr, nullptr, &si, &pi))
             ThrowLastError("CreateProcessW");
+        CloseHandle(pi.hThread);
         auto aCloseProcHandleGuard(Guard(pi.hProcess));
         WriteLog(hInst, "CreateProcessW succeeded");