mpi/tests/block_interface.c: free allocated memory

mpi/tests/block_interface.c

@@ -135,6 +135,7 @@ int main(int argc, char **argv)
 	if (rank == 0 || rank == 1)
 	{
 	     starpu_data_unregister(block_handle);
+	     free(block);
 	}
 	starpu_mpi_shutdown();
 	starpu_shutdown();