* Use local variable in ServerEchoRead, ClientRead (#2562)

* use local var in ServerEchoRead, ClientRead

* zero init in GetResponse
* check sizeof deckBuffer in LoadDeck (#2564)

* Revert "fix"

This reverts commit 51aa89407bc107ede4bc9b56c97002fa9a7edca6.

* check sizeof deckBuffer in LoadDeck

* clear current_deck when selecting a wrong file