QUIC: Fix no-quic builds

Fix extension list
Use SSL_IS_QUIC()

Do a trivial change to make code closer to upstreaam
(i.e. slightly better diff).

Configure

@@ -486,7 +486,7 @@ my @disable_cascades = (
     "ssl3-method"       => [ "ssl3" ],
     "zlib"              => [ "zlib-dynamic" ],
     "des"               => [ "mdc2" ],
-    "ec"                => [ "ecdsa", "ecdh" ],
+    "ec"                => [ "ecdsa", "ecdh", "quic" ],
 
     "dgram"             => [ "dtls", "sctp" ],
     "sock"              => [ "dgram" ],

ssl/statem/extensions.c

@@ -403,6 +403,7 @@ static const EXTENSION_DEFINITION ext_defs[] = {
     },
 #else
     INVALID_EXTENSION,
+    INVALID_EXTENSION,
 #endif
     {
         /* Must be immediately before pre_shared_key */

ssl/statem/extensions_clnt.c

@@ -1985,7 +1985,7 @@ int tls_parse_stoc_early_data(SSL *s, PACKET *pkt, unsigned int context,
          * QUIC server must send 0xFFFFFFFF or it's a PROTOCOL_VIOLATION
          * per draft-ietf-quic-tls-27 S4.5
          */
-        if (s->quic_method != NULL && max_early_data != 0xFFFFFFFF) {
+        if (SSL_IS_QUIC(s) && max_early_data != 0xFFFFFFFF) {
             SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_F_TLS_PARSE_STOC_EARLY_DATA,
                      SSL_R_INVALID_MAX_EARLY_DATA);
             return 0;

ssl/statem/extensions_srvr.c

@@ -1971,12 +1971,12 @@ EXT_RETURN tls_construct_stoc_early_data(SSL *s, WPACKET *pkt,
     if (context == SSL_EXT_TLS1_3_NEW_SESSION_TICKET) {
         uint32_t max_early_data = s->max_early_data;
 
-        if (max_early_data == 0)
+        if (s->max_early_data == 0)
             return EXT_RETURN_NOT_SENT;
 
 #ifndef OPENSSL_NO_QUIC
         /* QUIC server must always send 0xFFFFFFFF, per draft-ietf-quic-tls-27 S4.5 */
-        if (s->quic_method != NULL)
+        if (SSL_IS_QUIC(s))
             max_early_data = 0xFFFFFFFF;
 #endif
 

ssl/statem/statem_clnt.c

@@ -911,7 +911,7 @@ int ossl_statem_client_construct_message(SSL *s, WPACKET *pkt,
     case TLS_ST_CW_END_OF_EARLY_DATA:
 #ifndef OPENSSL_NO_QUIC
         /* QUIC does not send EndOfEarlyData, draft-ietf-quic-tls-24 S8.3 */
-        if (s->quic_method != NULL) {
+        if (SSL_IS_QUIC(s)) {
             *confunc = NULL;
             *mt = SSL3_MT_DUMMY;
             break;