markj 2bc293973b Improve unix socket PCB refcounting.
- Use refcount_init().
- Define an INVARIANTS-only zone destructor to assert that various
  bits of PCB state aren't left dangling.
- Annotate unp_pcb_rele() with __result_use_check.
- Simplify control flow.

Reviewed by:	glebius, kevans, kib
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D26295
2020-09-15 19:21:58 +00:00
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