When the support for "synthetic errno" was added, we started truncating the errno value to just the least significant byte. This is generally OK, because errno values are defined up to ~130. The docs don't really say what the maximum value is. But at least in principle higher values could be added in the future. So let's stop truncating the values needlessly. The kernel (or libbpf?) have an error where they return 524 as an errno value (https://bugzilla.redhat.com/show_bug.cgi?id=2036145). We would confusingly truncate this to 12 (ENOMEM). It seems much nicer to let strerror() give us "Unknown error 524" rather than to print the bogus message about ENOMEM.
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