Ed Maste 2f70fca5ec Improve lock and unlock symmetry
- Move destruction of per-ring locks to netmap_dtor_locked to mirror the
initialization that happens in NIOCREGIF.  Otherwise unloading a netmap-
capable interface that was never put into netmap mode would try to
mtx_destroy an uninitialized mutex, and panic.

- Destroy core_lock in netmap_detach, mirroring init in netmap_attach.

- Also comment out the knlist_destroy for now as there is currently no
knlist_init.

Sponsored by:   ADARA Networks
Reviewed by:    luigi@
2012-08-09 14:46:52 +00:00
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