mpi/tests/ring*: unregister data

mpi/tests/ring.c

@@ -119,6 +119,7 @@ int main(int argc, char **argv)
 		}
 	}
 
+	starpu_data_unregister(token_handle);
 	starpu_mpi_shutdown();
 	starpu_shutdown();
 

mpi/tests/ring_async.c

@@ -123,6 +123,7 @@ int main(int argc, char **argv)
 		}
 	}
 
+	starpu_data_unregister(token_handle);
 	starpu_mpi_shutdown();
 	starpu_shutdown();
 

mpi/tests/ring_async_implicit.c

@@ -118,6 +118,7 @@ int main(int argc, char **argv)
 
 	starpu_task_wait_for_all();
 
+	starpu_data_unregister(token_handle);
 	starpu_mpi_shutdown();
 	starpu_shutdown();