Fix memory-counting error in rephist.c. Bug 18651. (Now with actual patch)

src/or/rephist.c

@@ -1793,6 +1793,7 @@ rep_hist_remove_predicted_ports(const smartlist_t *rmv_ports)
   SMARTLIST_FOREACH_BEGIN(predicted_ports_list, predicted_port_t *, pp) {
     if (bitarray_is_set(remove_ports, pp->port)) {
       tor_free(pp);
+      rephist_total_alloc -= sizeof(*pp);
       SMARTLIST_DEL_CURRENT(predicted_ports_list, pp);
     }
   } SMARTLIST_FOREACH_END(pp);