- Fix a really obvious error: ipl_enable() disappeared, but the guts of
the function were scrunched into the "no-op" BSD pseudo-device attach
routine. Would not compile, because of non-void return from a void
function. Fixed by reincarnating ipl_enable(), and reimplementing
the no-op pseudo-device attach.
- #ifdef as appropriate to remove unused variable warnings.
- Call ipl_enable() in iplinit(), rather than the no-op ipfilterattach().
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