destroy proxies when global is removed

When a global is removed, also remove the proxies. We can have multiple
proxies to a global otherwise when a client has a sequence of events
queued from the server like this:

Global 1 added
Global 1 removed
Global 1 added

The proxy we added in the firt event would not be destroyed because the
server did not know about it when global 1 was removed and then a
second one would be made.

pipewire-alsa/alsa-plugins/ctl_pipewire.c

@@ -1165,8 +1165,10 @@ static void registry_event_global_remove(void *data, uint32_t id)
 	struct global *g;
 	const char *name;
 
-	if ((g = find_global(ctl, id, NULL, PW_TYPE_INTERFACE_Node)) == NULL)
+	if ((g = find_global(ctl, id, NULL, NULL)) == NULL)
 		return;
+
+	if (spa_streq(g->ginfo->type, PW_TYPE_INTERFACE_Node)) {
 		if ((name = pw_properties_get(g->props, PW_KEY_NODE_NAME)) == NULL)
 			return;
 
@@ -1174,6 +1176,8 @@ static void registry_event_global_remove(void *data, uint32_t id)
 			ctl->default_sink[0] = '\0';
 		if (spa_streq(name, ctl->default_source))
 			ctl->default_source[0] = '\0';
+	}
+	pw_proxy_destroy(g->proxy);
 }
 
 static const struct pw_registry_events registry_events = {

pipewire-v4l2/src/pipewire-v4l2.c

@@ -633,8 +633,25 @@ static void registry_event_global(void *data, uint32_t id,
 	}
 }
 
-static void registry_event_global_remove(void *object, uint32_t id)
+static struct global *find_global(struct file *file, uint32_t id)
 {
+	struct global *g;
+	spa_list_for_each(g, &file->globals, link) {
+		if (g->id == id)
+			return g;
+	}
+	return NULL;
+}
+
+static void registry_event_global_remove(void *data, uint32_t id)
+{
+	struct file *file = data;
+	struct global *g;
+
+	if ((g = find_global(file, id)) == NULL)
+		return;
+
+	pw_proxy_destroy(g->proxy);
 }
 
 static const struct pw_registry_events registry_events = {

src/tools/pw-cli.c

@@ -369,6 +369,8 @@ static int destroy_global(void *obj, void *data)
 	if (global == NULL)
 		return 0;
 
+	if (global->proxy)
+		pw_proxy_destroy(global->proxy);
 	pw_map_insert_at(&global->rd->globals, global->id, NULL);
 	pw_properties_free(global->properties);
 	free(global->type);