1. Initialize a local variable DoKexInit() as a compiler complains it is
   getting used with a garbage value. (Not true, but hushing the
   compiler.)
2. In GetInputText() add braces around the error check if clauses, and
   give the version error its own check instead of a ternary return.
3. In GetInputData(), if the recv return was anything else, return a
   general socket error.