errno oversight

In refs.c in origin/next and origin/seen, we have the following fragment:

                   if (refs_read_raw_ref(refs, refname, oid, &sb_refname,
                                      &read_flags, failure_errno)) {
                        *flags |= read_flags;
                        if (errno)
                                *failure_errno = errno;

overwriting failure_errno looks like an oversight?

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