Clean up io_input() for the "no input available" case

Clean up io_input() for the "no input available" case

Return zero when no input is available, regardless of parameter
waitforinput.  Before, it returned -1 with errno set to EAGAIN or
EWOULDBLOCK when not waiting for input.  Current callers all wait.

Drop errno from the function's contract, for consistency with
io_output().