CLEANUP: quic: No more used handshake output buffer

->obuf quic_conn struct member is no more used.

include/haproxy/xprt_quic-t.h

@@ -727,11 +727,6 @@ struct quic_conn {
 
 	/* Used only to reach the tasklet for the I/O handler from this quic_conn object. */
 	struct connection *conn;
-	/* Output buffer used during the handshakes. */
-	struct {
-		unsigned char data[QUIC_PACKET_MAXLEN];
-		unsigned char *pos;
-	} obuf;
 
 	struct {
 		/* The remaining frames to send. */

src/xprt_quic.c

@@ -4327,9 +4327,6 @@ static struct quic_conn *qc_new_conn(unsigned int version, int ipv4,
 	}
 	qc->mux_state = QC_MUX_NULL;
 
-	/* Initialize the output buffer */
-	qc->obuf.pos = qc->obuf.data;
-
 	icid = new_quic_cid(&qc->cids, qc, 0);
 	if (!icid) {
 		TRACE_PROTO("Could not allocate a new connection ID", QUIC_EV_CONN_INIT, qc);