allocate enough bytes
Originally committed as revision 1908 to svn://svn.ffmpeg.org/ffmpeg/trunk
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		@@ -151,8 +151,9 @@ static int fourxm_read_header(AVFormatContext *s,
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            }
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            current_track = LE_32(&header[i + 8]);
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            if (current_track + 1 > fourxm->track_count) {
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                fourxm->track_count++;
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                fourxm->tracks = av_realloc(fourxm->tracks, fourxm->track_count);
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                fourxm->track_count = current_track + 1;
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                fourxm->tracks = av_realloc(fourxm->tracks, 
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                    fourxm->track_count * sizeof(AudioTrack));
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                if (!fourxm->tracks) {
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                    av_free(header);
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                    return AVERROR_NOMEM;
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