- In if_link_state_change() extract function body from if-block, to improve   readability. - Call carp_carpdev_state() from if_link_state_change() if interface has   associated CARP interface.
- In if_link_state_change() extract function body from if-block, to improve
  readability.
- Call carp_carpdev_state() from if_link_state_change() if interface has
  associated CARP interface.

Sponsored by:	Rambler

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