message: fix numThreadsMax for OpenMP
  introduced by commit
diff: @@ -427,7 +427,7 @@ static inline int _initMaxThreads()
  {
  omp_set_dynamic(maxThreads);
  }
  - return numThreads;
  + return maxThreads;
  }
  static int numThreadsMax = _initMaxThreads();
  #elif defined HAVE_GCD
  