message: Fix missing semicolon
  I have found this in realm-core 5.4.2 and it's still present.
diff: @@ -736,7 +736,7 @@ inline void CondVar::wait(RobustMutex& m, Func recover_func, const struct timesp
  if (r == ERROR_TIMEOUT)
  return;
  } else {
  - r = 0
  + r = 0;
  }
  #else
  r = pthread_cond_timedwait(&m_impl, &m.m_impl, tp);
  