schbench: Fix GCC 9 warnings

Signed-off-by: Danny Lin <[email protected]>

schbench.c

@@ -705,7 +705,6 @@ static void run_rps_thread(struct thread_data *worker_threads_mem)
  unsigned long sleep_time;
  /* total number of times we kicked a worker */
  unsigned long total_wakes = 0;
- int left;
  int cur_tid = 0;
  int i;
 
@@ -719,17 +718,15 @@ static void run_rps_thread(struct thread_data *worker_threads_mem)
  usleep(sleep_time);
 
  gettimeofday(&start, NULL);
- left = nr_to_wake;
 
  for (i = 0; i < nr_to_wake; i++) {
  struct thread_data *worker;
- struct request *old;
 
  worker = worker_threads_mem + cur_tid % worker_threads;
  cur_tid++;
 
  request = allocate_request();
- old = request_add(worker, request);
+ request_add(worker, request);
  total_wakes++;
  memcpy(&worker->wake_time, &start, sizeof(start));
  fpost(&worker->futex);