static int ssh_closing(Plug plug, char *error_msg, int error_code,
static int ssh_closing(Plug plug, const char *error_msg, int error_code,
static int ssh_closing(Plug plug, char *error_msg, int error_code,		       int calling_back){    Ssh ssh = (Ssh) plug;    ssh_do_close(ssh);    if (error_msg) {	/* A socket error has occurred. */	logevent(error_msg);	connection_fatal(ssh->frontend, "%s", error_msg);    } else {	/* Otherwise, the remote side closed the connection normally. */    }    return 0;}