libweston: Remove signals from the list during de-init

During de-init ensure removal of added signals from list. Otherwise
a dongling pointer is left behind which will affect other plugins.

Signed-off-by: Harsha M M <harsha.manjulamallikarjun@in.bosch.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

compositor/text-backend.c

@@ -452,6 +452,7 @@ text_input_manager_notifier_destroy(struct wl_listener *listener, void *data)
 			     struct text_input_manager,
 			     destroy_listener);
 
+	wl_list_remove(&text_input_manager->destroy_listener.link);
 	wl_global_destroy(text_input_manager->text_input_manager_global);
 
 	free(text_input_manager);
@@ -1060,6 +1061,8 @@ text_backend_configuration(struct text_backend *text_backend)
 WL_EXPORT void
 text_backend_destroy(struct text_backend *text_backend)
 {
+	wl_list_remove(&text_backend->seat_created_listener.link);
+
 	if (text_backend->input_method.client) {
 		/* disable respawn */
 		wl_list_remove(&text_backend->client_listener.link);

compositor/weston-screenshooter.c

@@ -162,6 +162,8 @@ screenshooter_destroy(struct wl_listener *listener, void *data)
 	struct screenshooter *shooter =
 		container_of(listener, struct screenshooter, destroy_listener);
 
+	wl_list_remove(&shooter->destroy_listener.link);
+
 	wl_global_destroy(shooter->global);
 	free(shooter);
 }

desktop-shell/shell.c

@@ -4911,6 +4911,7 @@ shell_destroy(struct wl_listener *listener, void *data)
 		wl_client_destroy(shell->child.client);
 	}
 
+	wl_list_remove(&shell->destroy_listener.link);
 	wl_list_remove(&shell->idle_listener.link);
 	wl_list_remove(&shell->wake_listener.link);
 	wl_list_remove(&shell->transform_listener.link);