balloc: Fix memory leak when get_block() fails.
extensions/mkpasswd: Do not leak /dev/random fd.
conf: Do not leak memory when modules::module is already loaded.
Replace double semicolons with single; place null statement on its own line.

No functional change is intended.
modules: Fix bad sizeofs.
modlist: Fix address display on 64-bit systems.
part: Fix constness issue with part hook.
Fix various printf arg types.