avformat/nuv: use ff_get_extradata()

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

libavformat/nuv.c

@@ -86,9 +86,8 @@ static int get_codec_data(AVIOContext *pb, AVStream *vst,
                     av_freep(&vst->codec->extradata);
                     vst->codec->extradata_size = 0;
                 }
-                if (ff_alloc_extradata(vst->codec, size))
+                if (ff_get_extradata(vst->codec, pb, size) < 0)
                     return AVERROR(ENOMEM);
-                avio_read(pb, vst->codec->extradata, size);
                 size = 0;
                 if (!myth)
                     return 0;