BUG/MINOR: quic: Trace fix about packet number space information.

<qc> variable was confused with <qel>. The consequence was that it was
always the same packet number space which was displayed: the first one (or
the Initial packet number space).

Must be backported to 2.6.
diff --git a/src/xprt_quic.c b/src/xprt_quic.c
index 108a6e0..4cfd60f 100644
--- a/src/xprt_quic.c
+++ b/src/xprt_quic.c
@@ -352,7 +352,7 @@
 			const ssize_t *room = a4;
 
 			if (qel) {
-				const struct quic_pktns *pktns = qc->pktns;
+				const struct quic_pktns *pktns = qel->pktns;
 				chunk_appendf(&trace_buf, " qel=%c cwnd=%llu ppif=%lld pif=%llu "
 				              "if=%llu pp=%u",
 				              quic_enc_level_char_from_qel(qel, qc),