use c++ variadic template instead of variadic function

lib/include/srslte/common/fsm.h

@@ -199,7 +199,8 @@ struct fsm_helper {
       fsm_helper::handle_state_change(f, &target_state, &s);
       return true;
     }
-    bool call_react(...)
+    template <typename... Args>
+    bool call_react(Args...)
     {
       f->log_fsm_activity(
           "FSM \"%s\": Unhandled event caught: \"%s\"\n", get_type_name<FSM>().c_str(), get_type_name<Event>().c_str());

srsenb/hdr/stack/mac/ue.h

@@ -78,7 +78,7 @@ public:
 
   bool     process_pdus();
   uint8_t* request_buffer(const uint32_t ue_cc_idx, const uint32_t tti, const uint32_t len);
-  void     process_pdu(uint8_t* pdu, uint32_t nof_bytes, srslte::pdu_queue::channel_t channel);
+  void     process_pdu(uint8_t* pdu, uint32_t nof_bytes, srslte::pdu_queue::channel_t channel) override;
   void     push_pdu(const uint32_t ue_cc_idx, const uint32_t tti, uint32_t len);
   void     deallocate_pdu(const uint32_t ue_cc_idx, const uint32_t tti);