threading: transform *-cpu-set nodes from list items to nodes

Part of Ticket 2321 work to remove unnecessary lists from
the config file.

Ticket: 2321

src/util-affinity.c

@@ -483,7 +483,7 @@ void AffinitySetupLoadFromConfig(void)
 
     ConfNode *affinity;
     TAILQ_FOREACH(affinity, &root->head, next) {
-        const char *setname = GetAffinitySetName(affinity->val);
+        const char *setname = GetAffinitySetName(affinity->name);
         if (setname == NULL)
             continue;