[gnutls-devel] GnuTLS | Fix issues in record_size_limit extension handling (!879)

[Development of GNU's TLS library]

Daiki Ueno commented on a discussion on lib/gnutls_int.h:

>  {
>  	size_t max;
>  
> -	if (IS_DTLS(session)) {
> -		max = MIN(gnutls_dtls_get_data_mtu(session), session->security_parameters.max_record_send_size);
> -	} else {
> -		max = session->security_parameters.max_record_send_size;
> -	}
> +	max = MIN(session->security_parameters.max_record_send_size,
> +		  session->security_parameters.max_record_recv_size);

`max_record_recv_size` is documented as:
```
        /* The send size is the one requested by the programmer.
         * The recv size is the one negotiated with the peer.
         */
        uint16_t max_record_send_size;
        uint16_t max_record_recv_size;
```
That means both `max_record_send_size` and `max_record_recv_size` should be used for calculating the maximum user data (i.e. plaintext without content type) to be sent.
I will add doc string there.

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