o Introduce carp_multicast_cleanup(), which removes and frees

  multicast addresses from carp interface. [1]
o Rewrite carpdetach(), so that it does the following things: [1]
  - Stops callouts.
  - Decrements carp_suppress_preempt, if needed.
  - Downs interface and sets CARP state to INIT.
  - Calls carp_multicast_cleanup().
  - Detaches softc from carp_if and if we are the last frees
    the carp_if.
o Use new carpdetach() in carp_clone_destroy().
o In carp_ifdetach() acquire the carp_if lock and cleanup all
  interfaces hanging on carp_if. [1]
o Make carp_ifdetach() static and use EVENT(9) to call it
  from if_detach(). [2]
o In carp_setrun() exit if the softc doesn't have a valid pointer
  to parent. [1]

Obtained from:	OpenBSD [1]
Submitted by:	Dan Lukes <dan obluda.cz> [2]
PR:		kern/82908 [2]

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