* Fix -Wlogical-not-parentheses warning
The warning occurs because `operator!()` has higher precedence than `operator>()`.
Alternatively, we can use:
```
iClient->connect(iServerAddress, iServerPort) <= 0
```
Error in question:
ArduinoHttpClient/src/HttpClient.h: In member function 'virtual void HttpClient::flush()':
ArduinoHttpClient/src/HttpClient.h:310:50: error: return-statement with a value, in function returning 'void' [-fpermissive]
Return invalidated String if memory allocation fails or content length
does not match body data length. Also, use timed reads to support
responses without a content length.
