Heft: do not increment fifo->ntasks in push_task_on_best_worker().

_starpu_fifo_push_task() does the incrementation for us.

src/sched_policies/heft.c

@@ -207,7 +207,6 @@ static int push_task_on_best_worker(struct starpu_task *task, int best_workerid,
 	fifo->exp_end += predicted_transfer;
 	fifo->exp_len += predicted_transfer;
 
-	fifo->ntasks++;
 	_STARPU_PTHREAD_MUTEX_UNLOCK(&sched_mutex[best_workerid]);
 
 	task->predicted = predicted;