Mutex overflow logic with rrc API in phch_recv

srsue/src/phy/phch_recv.cc

@@ -498,6 +498,7 @@ void phch_recv::run_thread()
     /* Radio overflow detected. If CAMPING, go through SFN sync again and when
      * SFN is found again go back to camping
      */
+    if (!pthread_mutex_trylock(&rrc_mutex)) {
       if (radio_is_overflow) {
         // If we are coming back from an overflow
         if (radio_overflow_return) {
@@ -523,6 +524,8 @@ void phch_recv::run_thread()
           // If overflow occurs in any other state, it does not harm
         }
       }
+      pthread_mutex_unlock(&rrc_mutex);
+    }
 
     // Increase TTI counter
     tti = (tti+1) % 10240;