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remove compiler warnings, dead stores

#include <threads.h>
#include <sys/futex.h>
#include <errno.h>

int cnd_timedwait(cnd_t* cond, mtx_t* mutex, const struct timespec* time_point) {
  int r;
  do {
    r=futex(&cond->sem,FUTEX_WAIT,0,time_point,0,0);
    if (r==-1) {
      if (errno==EWOULDBLOCK) break;
      else if (errno==EINTR) continue;
    } else
      break;
  } while (r==0);
  cond->sem=0;
  return mtx_timedlock(mutex,time_point);
}