[Bug 252551] POSIX compliance: writev does not return EINVAL when iovcnt == 0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252551

            Bug ID: 252551
           Summary: POSIX compliance: writev does not return EINVAL when
                    iovcnt == 0
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

POSIX requires that readv and writev return EINVAL when iovcnt == 0.  Our own
man pages document that condition as well.

https://pubs.opengroup.org/onlinepubs/9699919799/functions/writev.html
https://pubs.opengroup.org/onlinepubs/9699919799/functions/readv.html

However, we accept iovcnt == 0, do nothing, and return 0.  That's not
inherently unreasonable, but it's not POSIX-compliant.  From inspection,
OpenBSD and NetBSD do not have this bug, but DragonflyBSD does.

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