K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2020-07-06T21:20:57.727347Z
K 7
svn:log
V 401
Split nhop_ref_object().

Now nhop_ref_object() unconditionally acquires a reference, and the new
nhop_try_ref_object() uses refcount_acquire_if_not_zero() to
conditionally acquire a reference.  Since the former is cheaper, use it
when we know that the initial counter value is non-zero.  No functional
change intended.

Reviewed by:	melifaro
Differential Revision:	https://reviews.freebsd.org/D25535

END