* bug fix for rxdelay 0

examples/simple_room_server/main.cpp

@@ -251,6 +251,7 @@ protected:
   }
 
   int calcRxDelay(float score, uint32_t air_time) const override {
+    if (_prefs.rx_delay_base <= 0.0f) return 0;
     return (int) ((pow(_prefs.rx_delay_base, 0.85f - score) - 1.0) * air_time);
   }