Remove store-only variable and unnecessary bzero()
- Remove the variable set but not used to fix build on -CURRENT
- Remove bzero() on the space malloc'd with M_ZERO flag.
Signed-off-by: En-Wei Wu <enweiwu@FreeBSD.org>
Sponsored by: Google, Inc. (GSoC 2022)
Differential Revision: https://reviews.freebsd.org/D35624