Fix data race in proc_sr_nr.

srsue/src/stack/mac_nr/proc_sr_nr.cc

@@ -45,8 +45,11 @@ void proc_sr_nr::reset_nolock()
 
 int32_t proc_sr_nr::set_config(const srsran::sr_cfg_nr_t& cfg_)
 {
+  {
+    std::lock_guard<std::mutex> lock(mutex);
     // disable by default
     cfg.enabled = false;
+  }
 
   if (cfg_.num_items != 1) {
     logger.error("Only one SR config supported. Disabling SR.");
@@ -69,8 +72,11 @@ int32_t proc_sr_nr::set_config(const srsran::sr_cfg_nr_t& cfg_)
     logger.info("SR:    Disabling procedure");
   }
 
+  {
+    std::lock_guard<std::mutex> lock(mutex);
     // store config
     cfg = cfg_;
+  }
 
   return SRSRAN_SUCCESS;
 }