DOF tables are aligned according to the DOF section's alignment constraint,
so take this into account when iterating over DOF tables.

PR:		195555
Submitted by:	Fedor Indutny <fedor@indutny.com> (original version)
MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@276250 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f