kib c8ac9961b7 Switch the rest of the refcount(9) functions to bool return type.
There are some explicit comparisions of refcount_release(9) result
with 0/1, which are fine.

Reviewed by:	markj, mjg
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D21014
2019-07-21 20:16:48 +00:00
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