e2ap,metrics: removing unused variable from e2 metrics

srsenb/hdr/metrics_e2.h

@@ -41,7 +41,6 @@ public:
 
 private:
   std::atomic<bool>         do_print = {false};
-  uint8_t                   n_reports = 0;
   std::queue<enb_metrics_t> metrics_queue;
   enb_metrics_interface*    enb = nullptr;
   std::vector<e2sm*>        e2sm_vec;