libav migration issue

puts("Doing SHIZ!");
printf("LIBAV VERSION: %i\n",LIBAVCODEC_VERSION_MAJOR);

AVCodec* codec = avcodec_find_decoder(file->codec_context->codec_id);

if (avcodec_open2(file->codec_context, codec, NULL) < 0)
    return NULL;

AVPacket packet;
int decoded;

enum AVSampleFormat sample_format = file->codec_context->sample_fmt;
AVFrame* frame = avcodec_alloc_frame();

if(av_read_frame(file->format_context, &packet) != 0)
    return NULL;

avcodec_decode_audio4(file->codec_context, frame, &decoded, &packet);

if(decoded != 0)
{
    puts("Doing SHIZA!");
    if(frame->format != sample_format)
        return NULL;
}
else
{
    puts("Doing SHIZB!");
    return NULL;
}

puts("Doing SHIZ2!");

///////////////////////
// Output
///////////////////////
// Doing SHIZ!
// LIBAV VERSION: 54
// [flac @ 0x11e3160] invalid sync code
// [flac @ 0x11e3160] invalid frame header
// [flac @ 0x11e3160] decode_frame() failed
// Doing SHIZB!
///////////////////////