Unbreak the world build (in sbin/gbde).  This file is used by both kernel and world, so KASSERT() needs to be wrapped within an #ifdef _KERNEL / #endif pair.
Unbreak the world build (in sbin/gbde).  This file is used by both
kernel and world, so KASSERT() needs to be wrapped within an #ifdef
_KERNEL / #endif pair.

Reported by:	krion, tinderbox

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase