Function cache_fpl_pathlen_add

freebsd/kern/vfs_cache.c:5200–5207

 */
#ifdef INVARIANTS
static void
cache_fpl_pathlen_add(struct cache_fpl *fpl, size_t n)
{

	fpl->debug.ni_pathlen += n;
	KASSERT(fpl->debug.ni_pathlen <= PATH_MAX,
	    ("%s: pathlen overflow to %zd\n", __func__, fpl->debug.ni_pathlen));
}

static void
cache_fpl_pathlen_sub(struct cache_fpl *fpl, size_t n)