MINOR: quic: Add traces about TX frame memory releasing

Add such traces in qc_treat_acked_tx_frm(). This should be helpful to track memory
leak issues for TX frames.
diff --git a/src/xprt_quic.c b/src/xprt_quic.c
index 4eb4d24..b1ffc12 100644
--- a/src/xprt_quic.c
+++ b/src/xprt_quic.c
@@ -1484,6 +1484,7 @@
                                          struct quic_frame *frm)
 {
 	int stream_acked;
+	uint64_t pn;
 
 	TRACE_PROTO("Removing frame", QUIC_EV_CONN_PRSAFRM, qc, frm);
 	stream_acked = 0;
@@ -1507,7 +1508,10 @@
 		if (!node) {
 			TRACE_PROTO("acked stream for released stream", QUIC_EV_CONN_ACKSTRM, qc, strm_frm);
 			LIST_DELETE(&frm->list);
+			pn = frm->pkt->pn_node.key;
 			quic_tx_packet_refdec(frm->pkt);
+			TRACE_PROTO("freeing frame from packet",
+			            QUIC_EV_CONN_PRSAFRM, qc, frm, &pn);
 			pool_free(pool_head_quic_frame, frm);
 
 			/* early return */
@@ -1527,13 +1531,19 @@
 				/* no need to continue if stream freed. */
 				TRACE_PROTO("stream released and freed", QUIC_EV_CONN_ACKSTRM, qc);
 				LIST_DELETE(&frm->list);
+				pn = frm->pkt->pn_node.key;
 				quic_tx_packet_refdec(frm->pkt);
+				TRACE_PROTO("freeing frame from packet",
+				            QUIC_EV_CONN_PRSAFRM, qc, frm, &pn);
 				pool_free(pool_head_quic_frame, frm);
 				break;
 			}
 
 			LIST_DELETE(&frm->list);
+			pn = frm->pkt->pn_node.key;
 			quic_tx_packet_refdec(frm->pkt);
+			TRACE_PROTO("freeing frame from packet",
+			            QUIC_EV_CONN_PRSAFRM, qc, frm, &pn);
 			pool_free(pool_head_quic_frame, frm);
 		}
 		else {
@@ -1545,7 +1555,10 @@
 	break;
 	default:
 		LIST_DELETE(&frm->list);
+		pn = frm->pkt->pn_node.key;
 		quic_tx_packet_refdec(frm->pkt);
+		TRACE_PROTO("freeing frame from packet",
+		            QUIC_EV_CONN_PRSAFRM, qc, frm, &pn);
 		pool_free(pool_head_quic_frame, frm);
 	}