Update GPS.cpp

src/gps/GPS.cpp

@@ -145,7 +145,7 @@ bool GPS::setupGPS()
     if (_serial_gps && !didSerialInit) {
         didSerialInit = true;
 
-#if ARCH_ESP32
+#ifdef ARCH_ESP32
     // In esp32s3 framework, setRxBufferSize needs to be initialized before Serial
     _serial_gps->setRxBufferSize(2048); // the default is 256
 #endif