Merge pull request #379 from martinetd/shutdown_asan

Shutdown ASAN fixes

backend/libinput/backend.c

@@ -105,6 +105,7 @@ static void wlr_libinput_backend_destroy(struct wlr_backend *_backend) {
 			wl_signal_emit(&backend->backend.events.input_remove, wlr_dev);
 			wlr_input_device_destroy(wlr_dev);
 		}
+		free(wlr_devices);
 	}
 	wlr_list_free(backend->wlr_device_lists);
 	wl_event_source_remove(backend->input_event);

backend/multi/backend.c

@@ -30,8 +30,8 @@ static bool multi_backend_start(struct wlr_backend *_backend) {
 
 static void multi_backend_destroy(struct wlr_backend *_backend) {
 	struct wlr_multi_backend *backend = (struct wlr_multi_backend *)_backend;
-	struct subbackend_state *sub;
-	wl_list_for_each(sub, &backend->backends, link) {
+	struct subbackend_state *sub, *next;
+	wl_list_for_each_safe(sub, next, &backend->backends, link) {
 		wlr_backend_destroy(sub->backend);
 		free(sub);
 	}