memset call with invalid value for fill character

[jwakely]

https://github.com/oneapi-src/oneTBB/blob/db334fc49b62ef8463e343c272da9bd9544b8514/test/tbbmalloc/test_malloc_whitebox.cpp#L493

This calls memset with minLargeObjectSize as the fill character, but that's a value much larger than UCHAR_MAX so will be truncated. What's the purpose of this call? Could it use a different value that doesn't upset static analyzers?