add stop_timers function to RRC and call it in rrc::stop()

- this solves an issue with shutting down RRC when the UE
  just sent a connection request (and activated timer T300)
  and stop was called.

srsue/hdr/upper/rrc.h

@@ -623,6 +623,7 @@ private:
   void          rrc_connection_release();
   void          radio_link_failure();
   void          leave_connected();
+  void          stop_timers();
 
   void          apply_rr_config_common_dl(LIBLTE_RRC_RR_CONFIG_COMMON_STRUCT *config);
   void          apply_rr_config_common_ul(LIBLTE_RRC_RR_CONFIG_COMMON_STRUCT *config);

srsue/src/upper/rrc.cc

@@ -219,6 +219,7 @@ void rrc::init(phy_interface_rrc *phy_,
 
 void rrc::stop() {
   running = false;
+  stop_timers();
   cmd_msg_t msg;
   msg.command = cmd_msg_t::STOP;
   cmd_q.push(msg);
@@ -1655,10 +1656,7 @@ void rrc::leave_connected()
   mac->reset();
   set_phy_default();
   set_mac_default();
-  mac_timers->timer_get(t301)->stop();
+  stop_timers();
-  mac_timers->timer_get(t310)->stop();
-  mac_timers->timer_get(t311)->stop();
-  mac_timers->timer_get(t304)->stop();
   rrc_log->info("Going RRC_IDLE\n");
   if (phy->cell_is_camping()) {
     // Receive paging
@@ -1668,10 +1666,14 @@ void rrc::leave_connected()
   }
 }
 
-
+void rrc::stop_timers()
-
+{
-
+  mac_timers->timer_get(t300)->stop();
-
+  mac_timers->timer_get(t301)->stop();
+  mac_timers->timer_get(t310)->stop();
+  mac_timers->timer_get(t311)->stop();
+  mac_timers->timer_get(t304)->stop();
+}
 
 /*******************************************************************************
 *