deraadt@openbsd.org upstream: When system calls indicate an error they return -1, not
Latest commit 4d28fa7 Jun 28, 2019 History 
some arbitrary value < 0.  errno is only updated in this case.  Change all
(most?) callers of syscalls to follow this better, and let's see if this
strictness helps us in the future.

OpenBSD-Commit-ID: 48081f00db7518e3b712a49dca06efc2a5428075
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