Audio: do not exit init prematurely

Finish initialization even if we are not using audio since otherwise
we'd have partially initialized state that causes problems on cleanup
(eg. participants are not initalized but we may get mute events, eg.
from a keyboard).

src/audio/audio.cpp

@@ -267,11 +267,6 @@ struct state_audio * audio_cfg_init(struct module *parent, const char *addrs, in
         s = new state_audio(parent);
         s->start_time = *start_time;
 
-        if (strcmp("none", send_cfg) == 0 && strcmp("none", recv_cfg) == 0) {
-                // nothing to do, return empty state
-                return s;
-        }
-
         s->audio_channel_map = audio_channel_map;
         s->audio_scale = audio_scale;