unlock Progress mutex before doing ft service msg stuff

mpi/src/mpi/starpu_mpi_mpi.c

@@ -1505,7 +1505,9 @@ static void *_starpu_mpi_progress_thread_func(void *arg)
 			}
 		}
 #ifdef STARPU_USE_MPI_FT
+		STARPU_PTHREAD_MUTEX_UNLOCK(&progress_mutex);
 		starpu_mpi_ft_progress();
+		STARPU_PTHREAD_MUTEX_LOCK(&progress_mutex);
 #endif // STARPU_USE_MPI_FT
 #ifdef STARPU_SIMGRID
 		STARPU_PTHREAD_MUTEX_UNLOCK(&progress_mutex);