[FFmpeg-cvslog] avcodec/qdrw: cleanup skip code

[Carl Eugen Hoyos]

Michael Niedermayer <git <at> videolan.org> writes:

> +    while (   bytestream2_get_bytes_left(&gbc) >= 552
> +           && (   !AV_RB16(&avpkt->data[bytestream2_tell(&gbc)+6])
> +               || !AV_RB16(&avpkt->data[bytestream2_tell(&gbc)+8])))

The first 512 bytes are "reserved for your application". 
I don't think anything requires them to be 0.
After your patch, valid files will be auto-detected 
but not decoded.

Carl Eugen