K 10 svn:author V 2 np K 8 svn:date V 27 2013-08-14T23:36:33.010284Z K 7 svn:log V 440 Perform lazy initialization of a cluster's refcount if possible. This doesn't change anything for the common cases where the constructor is given an mbuf to attach to the cluster, or when the cluster is obtained with m_cljget(NULL, ...) and attached later with m_cljset(). But it allows for an alternate usage scenario where the cluster is managed EXT_EXTREF style without ever having to look up its "usual" refcount via uma_find_refcnt. END