Call SSLfatal when the generate_ticket_cb returns 0
Otherwise, the state machine ends up being in a bad state:
```
SSL routines:write_state_machine:missing fatal:ssl/statem/statem.c:XXX:
```
@@ -3945,9 +3945,10 @@ int tls_construct_new_session_ticket(SSL *s, WPACKET *pkt)
}
if (tctx->generate_ticket_cb != NULL &&
- tctx->generate_ticket_cb(s, tctx->ticket_cb_data) == 0)
+ tctx->generate_ticket_cb(s, tctx->ticket_cb_data) == 0) {
+ SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
goto err;
-
+ }
/*
* If we are using anti-replay protection then we behave as if
* SSL_OP_NO_TICKET is set - we are caching tickets anyway so there
