The unused result was reported by Clang-Tidy 11. It does make sense to check for the failed mmap() calls rather than quietly suppress errors. In this change failures are reported, but application execution is not aborted. This is a bit disputable, but it feels to be a safer thing to do now. It is unclear how to test the code though, as we don't have any tools in-place to simulate read errors. Differential Revision: https://developer.blender.org/D10223
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