Homogeneize component_fifo with component_prio

src/sched_policies/component_fifo.c

@@ -195,7 +195,10 @@ static int fifo_can_push(struct starpu_sched_component * component)
 	task = starpu_sched_component_pump_downstream(component, &res); 
 
 	if(task)
-		fifo_push_local_task(component,task,1);
+	{
+		int ret = fifo_push_local_task(component,task,1);
+		STARPU_ASSERT(!ret);
+	}
 
 	return res;
 }