hselasky fd834c513a Merge LinuxKPI changes from DragonflyBSD:
- Define the kref structure identical to the one found in Linux.
- Update clients referring inside the kref structure.
- Implement kref_sub() for FreeBSD.

Reviewed by:	np @
Sponsored by:	Mellanox Technologies
2015-10-19 12:26:38 +00:00
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