Solve Mutex inconsistence

mpi/src/mpi_failure_tolerance/starpu_mpi_ft_service_comms.c

@@ -180,7 +180,7 @@ int _starpu_mpi_ft_service_post_send(void* msg, int count, int rank, int tag, MP
 	STARPU_PTHREAD_MUTEX_LOCK(&ft_service_requests_mutex);
 	ready_send_ft_service_msg++;
 	_starpu_mpi_req_list_push_back(&ready_send_ft_service_requests, req);
-	STARPU_PTHREAD_MUTEX_LOCK(&ft_service_requests_mutex);
+	STARPU_PTHREAD_MUTEX_UNLOCK(&ft_service_requests_mutex);
 
 	_starpu_mpi_wake_up_progress_thread();