TT#14008 add locking for `bypass_seq` case

Some functions (packet_dtmf in particular) called from the sequencer
depend on upper-level locking, so make sure this happens even if we're
bypassing the sequencer and do passthrough.

Change-Id: I6c729c3ba8075736fd614b8c06e3415b9c9e5ca7

daemon/codec.c

@@ -1416,9 +1416,11 @@ static int __handler_func_sequencer(struct media_packet *mp, struct transcode_pa
 
 	if (packet->bypass_seq) {
 		// bypass sequencer
+		__ssrc_lock_both(mp);
 		int ret = packet->func(ch, ch, packet, mp);
 		if (ret != 1)
 			__transcode_packet_free(packet);
+		__ssrc_unlock_both(mp);
 		goto out_ch;
 	}