MINOR: mux_quic: handle STOP_SENDING in QMux

Ensure reception of STOP_SENDING via QMux protocol is properly handled.
This simply consists in using qcc_recv_stop_sending() which will update
the associated QCS if found.

Author: a-denoyelle

src/qcm_qmux.c

@@ -70,6 +70,10 @@ static int qmux_parse_frm(struct qcc *qcc, struct buffer *buf)
 		struct qf_reset_stream *rst_frm = &frm.reset_stream;
 		qcc_recv_reset_stream(qcc, rst_frm->id, rst_frm->app_error_code, rst_frm->final_size);
 	}
+	else if (frm.type == QUIC_FT_STOP_SENDING) {
+		struct qf_stop_sending *ss_frm = &frm.stop_sending;
+		qcc_recv_stop_sending(qcc, ss_frm->id, ss_frm->app_error_code);
+	}
 	else if (frm.type == QUIC_FT_MAX_DATA) {
 		struct qf_max_data *md_frm = &frm.max_data;
 		qcc_recv_max_data(qcc, md_frm->max_data);