message: remove un-used variant.
diff: @@ -57,7 +57,7 @@ int swThreadPool_create(swThreadPool *pool, int thread_num)
  int swThreadPool_dispatch(swThreadPool *pool, void *task, int task_len)
  {
  - int i, ret;
  + int ret;
  pool->cond.lock(&pool->cond);
  #ifdef SW_THREADPOOL_USE_CHANNEL
  