feat(ssl): Do not check if client is connected if already disconnected (espressif#11356)

Author: me-no-dev

libraries/NetworkClientSecure/src/NetworkClientSecure.cpp

@@ -315,9 +315,10 @@ int NetworkClientSecure::available() {
 }
 
 uint8_t NetworkClientSecure::connected() {
- uint8_t dummy = 0;
- read(&dummy, 0);
-
+ if (_connected) {
+ uint8_t dummy = 0;
+ read(&dummy, 0);
+ }
  return _connected;
 }