vqf: set packet parameters after av_new_packet()

Otherwise the values are overwritten.

libavformat/vqf.c

@@ -220,12 +220,12 @@ static int vqf_read_packet(AVFormatContext *s, AVPacket *pkt)
     int ret;
     int size = (c->frame_bit_len - c->remaining_bits + 7)>>3;
 
-    pkt->pos          = avio_tell(s->pb);
-    pkt->stream_index = 0;
-
     if (av_new_packet(pkt, size+2) < 0)
         return AVERROR(EIO);
 
+    pkt->pos          = avio_tell(s->pb);
+    pkt->stream_index = 0;
+
     pkt->data[0] = 8 - c->remaining_bits; // Number of bits to skip
     pkt->data[1] = c->last_frame_bits;
     ret = avio_read(s->pb, pkt->data+2, size);