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Colin Percival
6ddb10cf6b
The strtoul function sets errno on error, but does not clear it on
success; when using strtoul and checking errno (as one should) for
ERANGE / EINVAL afterwards, it's important to zero errno first.
While here, remove a dead store.
Reviewed by: phk
Fixes: 4fe8c1b67b ("Add error and range checking ... ")
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D59270