Deinit all tasks to avoid memory leaks.

tests/core/wait_all_regenerable_tasks.c

@@ -105,6 +105,9 @@ int main(int argc, char **argv)
 	}
 
 	ret = starpu_task_wait_for_all();
+	for (i = 0; i < K; i++)
+		starpu_task_deinit(&task[i]);
+
 	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_wait_for_all");
 
 	gettimeofday(&end, NULL);