[gnutls-devel] GnuTLS | add support for 0-RTT (!775)

[Development of GNU's TLS library]

Daiki Ueno commented on a discussion on lib/handshake-tls13.c:

>  #endif
>  		FALLTHROUGH;
>  	case STATE101:
> -		ret =
> -		    generate_and_set_hs_traffic_keys(session);
>  		STATE = STATE101;
> -		IMED_RET_FATAL("generate session keys", ret, 0);
> +		if (session->internals.hsk_flags & HSK_EARLY_DATA_ACCEPTED) {

It is possible, but we need to duplicate:
```c
ret = generate_hs_traffic_keys(session);
IMED_RET_FATAL("generate hs traffic keys", ret, 0);
```
in both branches, as it touches `session->key.proto.tls13.temp_secret`.  Anyway, did that change.

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