kbdint_free(kbdintctxt); authctxt->kbdintctxt = NULL;
auth2_challenge_stop(authctxt);
auth2_challenge_start(Authctxt *authctxt){	KbdintAuthctxt *kbdintctxt = authctxt->kbdintctxt;	debug2("auth2_challenge_start: devices %s",	    kbdintctxt->devices ?  kbdintctxt->devices : "<empty>");	if (kbdint_next_device(kbdintctxt) == 0) {		kbdint_free(kbdintctxt);		authctxt->kbdintctxt = NULL;		return 0;	}	debug("auth2_challenge_start: trying authentication method '%s'",	    kbdintctxt->device->name);	if ((kbdintctxt->ctxt = kbdintctxt->device->init_ctx(authctxt)) == NULL) {		kbdint_free(kbdintctxt);		authctxt->kbdintctxt = NULL;		return 0;	}	if (send_userauth_info_request(authctxt) == 0) {		kbdint_free(kbdintctxt);		authctxt->kbdintctxt = NULL;		return 0;	}	dispatch_set(SSH2_MSG_USERAUTH_INFO_RESPONSE,	    &input_userauth_info_response);	authctxt->postponed = 1;	return 0;}