mpi_pxlu: Fix mpi termination

mpi/examples/mpi_lu/plu_example.c

@@ -627,9 +627,7 @@ int main(int argc, char **argv)
 	starpu_cublas_shutdown();
 	starpu_mpi_shutdown();
 
-#if 0
 	MPI_Finalize();
-#endif
 
 	return 0;
 }