Update SoundWorldNull

src/audio/sound_world_null.cpp

@@ -37,12 +37,9 @@ public:
 	{
 	}
 
-	virtual SoundInstanceId play(const SoundResource* /*sr*/, bool /*loop*/, float /*volume*/, const Vector3& /*pos*/)
+	virtual SoundInstanceId play(const SoundResource& /*sr*/, bool /*loop*/, float /*volume*/, const Vector3& /*pos*/)
 	{
-		Id id;
-		id.id = INVALID_ID;
-		id.index = 0;
-		return id;
+		return 0;
 	}
 
 	virtual void stop(SoundInstanceId /*id*/)
@@ -78,7 +75,7 @@ public:
 	{
 	}
 
-	virtual void reload_sounds(const SoundResource* /*old_sr*/, const SoundResource* /*new_sr*/)
+	virtual void reload_sounds(const SoundResource& /*old_sr*/, const SoundResource& /*new_sr*/)
 	{
 	}