Fix build under -CURRENT following Sr329824.

This commit does not address big endian support, which will be addressed
by a separate revision and commit. This commit (and revision) only
addresses build breakage due to Sr329824.

Approved by: imp, wma, kan, mst_semihalf.com (Michal Stanek)
Differential Revision: https://reviews.freebsd.org/D14483