libvorbis: switch to ff_alloc_packet2().

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/libvorbis.c

@@ -353,8 +353,7 @@ static int oggvorbis_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 
     av_fifo_generic_read(s->pkt_fifo, &op, sizeof(ogg_packet), NULL);
 
-    if ((ret = ff_alloc_packet(avpkt, op.bytes))) {
-        av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
+    if ((ret = ff_alloc_packet2(avctx, avpkt, op.bytes))) {
         return ret;
     }
     av_fifo_generic_read(s->pkt_fifo, avpkt->data, op.bytes, NULL);