[FFmpeg-cvslog] avcodec/pngdec: consider chunk size in minimal size check

ffmpeg | branch: release/4.2 | Michael Niedermayer | Mon Jul 22 00:03:15 2019 +0200| [ee20e3ff2d1bd5b0e7bbe5ae2148632104987db6] | committer: Michael Niedermayer avcodec/pngdec: consider chunk size in minimal size check assuming each block contains an empty chunk there has to be at least 8 byte

[FFmpeg-cvslog] avcodec/pngdec: consider chunk size in minimal size check

ffmpeg | branch: master | Michael Niedermayer | Mon Jul 22 00:03:15 2019 +0200| [70432eac0b511105a5d6654cb794bc5f3e983ee0] | committer: Michael Niedermayer avcodec/pngdec: consider chunk size in minimal size check assuming each block contains an empty chunk there has to be at least 8 bytes ex