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Reported in https://github.com/esp8266/Arduino/issues/4078. WiFiClient::stopAll, called from a WiFi disconnected event handler, could be called while WiFiClient::connect was in progress. This issue was initially fixed in #4194, by testing `this` pointer for being non-null in ClientContext::connect. This change delegates deletion of ClientContext to WiFiClient destructor. WiFiClient::stop only calls ClientContext::stop, which closes/aborts the connection.