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Initialize return buffers in GetRawChar8 et al. (Port DWG read fix
from https://github.com/LibreCAD/libdxfrw) From the upstream message: GetRawChar8() would return spurious memory contents when the read failed,leading to weird crashes later in the code. Seen with older non-Autocad DWG files (that Autodesk DWG Trueview however accepts with just a warning about their foreign origin) obtained from RC model plane enthusiasts' free plans archive aerofred.com, e.g. their "Canadair p5.dwg" LibreCAD/libdxfrw@082409c
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