Small cleanup which addresses a warning regaring the truncation
of a 64-bit entity to a 32-bit entity. This issue was reported by
Peter Kasting from Google.

MFC after: 3 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271672 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f