Fix Vorbis bug on partial decode (affects spotty playback)

components/squeezelite/vorbis.c

@@ -269,7 +269,6 @@ static decode_state vorbis_decode(void) {
 		if (stream.state <= DISCONNECT) {
 			LOG_INFO("partial decode");
 			UNLOCK_O_direct;
-			UNLOCK_S;
 			return DECODE_COMPLETE;
 		} else {
 			LOG_INFO("no frame decoded");