FBSD: coalesce three assignments to the same variable

FBSD: coalesce three assignments to the same variable

Found-by: clang static analyzer
Reviewed-on: http://gerrit.openafs.org/5233
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit e3148c6bfad25fdcb86b7248bd6b05432502d4ce)

Change-Id: I549bbeb4397d357257497179cd459f6034f93113
Reviewed-on: http://gerrit.openafs.org/8373
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>