fixed typo

Author: KA7E

vpr/src/pack/re_cluster_util.h

@@ -107,7 +107,7 @@ bool pack_mol_in_existing_cluster(t_pack_molecule* molecule,
                                   std::unordered_set<AtomBlockId>* new_clb_atoms,
                                   bool during_packing,
                                   t_clustering_data& clustering_data,
-                                  t_lb_router_data*& router_data
+                                  t_lb_router_data*& router_data,
                                   bool enable_pin_feasibility_filter = true);
 
 /**