AP_Vehicle: fixed segfault in replay

libraries/AP_Vehicle/AP_Vehicle.cpp

@@ -130,7 +130,10 @@ void AP_Vehicle::setup()
     init_ardupilot();
     gcs().send_text(MAV_SEVERITY_INFO, "ArduPilot Ready");
 
+#if !APM_BUILD_TYPE(APM_BUILD_Replay)
     SRV_Channels::init();
+#endif
+
     // gyro FFT needs to be initialized really late
 #if HAL_GYROFFT_ENABLED
     gyro_fft.init(AP::scheduler().get_loop_period_us());