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Fix uninitialized variable warnings when MK_CASPER=no

Description

Fix uninitialized variable warnings when MK_CASPER=no

Submitted by: Ján Sučan <sucanjan@gmail.com>
MFC after: 2 weeks
Sponsored by: Google, inc. (Google Summer of Code 2019)
Differential Revision: https://reviews.freebsd.org/D21322