ue_stack_lte: use std::atomic for running var

srsue/hdr/stack/ue_stack_lte.h

@@ -180,7 +180,7 @@ private:
   const std::chrono::milliseconds TTI_WARN_THRESHOLD_MS{5};
   const uint32_t                  SYNC_QUEUE_WARN_THRESHOLD = 5;
 
-  bool                running;
+  std::atomic<bool>   running{false};
   srsue::stack_args_t args;
 
   srsran::tti_point current_tti;

srsue/src/stack/ue_stack_lte.cc

@@ -25,7 +25,6 @@ using namespace srsran;
 namespace srsue {
 
 ue_stack_lte::ue_stack_lte() :
-  running(false),
   args(),
   stack_logger(srslog::fetch_basic_logger("STCK", false)),
   mac_logger(srslog::fetch_basic_logger("MAC")),
@@ -40,8 +39,6 @@ ue_stack_lte::ue_stack_lte() :
   pdcp_nr_logger(srslog::fetch_basic_logger("PDCP-NR", false)),
   mac_pcap(),
   mac_nr_pcap(),
-  usim(nullptr),
-  phy(nullptr),
   rlc("RLC"),
   mac("MAC", &task_sched),
   rrc(this, &task_sched),