Error Message WiFiClient::flush()

[barakuda21]

Substitude in WiFiClient.cpp
the WiFiClient::flush() function
new function see below
after replacing no more error message
Source:
espressif/arduino-esp32#4736

Path:
C:/Users/uli/.platformio/packages/framework-arduinoespressif32/libraries/WiFi/src/WiFiClient.cpp \

new Function:
void WiFiClient::flush() {
if(available()){
while(read() >= 0) {};
}
}