ue,nr: Protect pending_cfgs in PHY worker_pool

srsue/src/phy/nr/worker_pool.cc

@@ -236,9 +236,12 @@ bool worker_pool::set_config(const srsran::phy_cfg_nr_t& new_cfg)
       w->release();
 
       // As the worker has been configured, there is no need to load new configuration from the real-time thread
+      {
+        std::lock_guard<std::mutex> lock(cfg_mutex);
         pending_cfgs[i] = false;
       }
     }
+  }
 
   logger.info("Setting new PHY configuration ARFCN=%d, PCI=%d", dl_arfcn, new_cfg.carrier.pci);