audio: keep vmstate handle with AudioState

QOM-ification continues.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

audio/audio.c

@@ -1622,6 +1622,9 @@ static void audio_state_init(Object *obj)
     QLIST_INIT(&s->hw_head_in);
     QLIST_INIT(&s->cap_head);
     s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s);
+
+    s->vmse = qemu_add_vm_change_state_handler(audio_vm_change_state_handler, s);
+    assert(s->vmse != NULL);
 }
 
 static void audio_state_finalize(Object *obj)
@@ -1671,6 +1674,11 @@ static void audio_state_finalize(Object *obj)
         timer_free(s->ts);
         s->ts = NULL;
     }
+
+    if (s->vmse) {
+        qemu_del_vm_change_state_handler(s->vmse);
+        s->vmse = NULL;
+    }
 }
 
 static Object *get_audiodevs_root(void)
@@ -1735,7 +1743,6 @@ static AudioState *audio_init(Audiodev *dev, Error **errp)
 {
     int done = 0;
     const char *drvname;
-    VMChangeStateEntry *vmse;
     AudioState *s;
     struct audio_driver *driver;
 
@@ -1775,9 +1782,6 @@ static AudioState *audio_init(Audiodev *dev, Error **errp)
         }
     }
 
-    vmse = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s);
-    assert(vmse != NULL);
-
     if (!object_property_try_add_child(get_audiodevs_root(), dev->id, OBJECT(s), errp)) {
         goto out;
     }

audio/audio_int.h

@@ -235,6 +235,7 @@ typedef struct AudioState {
 
     bool timer_running;
     uint64_t timer_last;
+    VMChangeStateEntry *vmse;
 } AudioState;
 
 extern const struct mixeng_volume nominal_volume;