Automatically call module registry cleanup on exit

main.c

@@ -92,6 +92,5 @@ main(int argc, char ** argv)
 
 	io_subscription_list_deinit(&state.wait_output);
 	io_subscription_list_deinit(&state.wait_input);
-	destroy_graph_node_specification_registry();
 	return 0;
 }

module_registry.c

@@ -35,6 +35,7 @@ lookup_graph_node_specification(const char * name)
 }
 
 void
+__attribute__((destructor)) void
 destroy_graph_node_specification_registry()
 {
 	ensure_initialized();