tta: fix 24-bit decoding.

Decode to the correct output buffer.

libavcodec/tta.c

@@ -314,7 +314,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
 
     // decode directly to output buffer for 24-bit sample format
     if (s->bps == 3)
-        s->decode_buffer = data;
+        s->decode_buffer = s->frame.data[0];
 
     // init per channel states
     for (i = 0; i < s->channels; i++) {