K 10
svn:author
V 3
kib
K 8
svn:date
V 27
2019-07-21T20:16:48.936421Z
K 7
svn:log
V 298
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

END