Fix Heap-buffer-overflow READ in Assimp::FileSystemFilter::Cleanup #5117
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Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=53488
it
was getting pass thein.end()
because it doesit += 3;
andit += 2;
in the loop and theconst size_t remaining = std::distance(in.end(), it);
becomes wrong.