Remove free'ing of an uninitialized variable

Just remove it completely from the test as it's initialized but unused apart
from the free(3) call

Differential Revision: https://reviews.freebsd.org/D4769 (part of larger diff)
MFC after: 5 days
Reported by: cppcheck
Reviewed by: oshogbo
Sponsored by: EMC / Isilon Storage Division