MINOR: quic: add const qualifier for traces function

Add const qualifier on arguments of several dump functions used in the
trace callback. This is required to be able to replace the first trace
argument by a quic_conn instance. The first argument is a const pointer
and so the members accessed through it must also be const.

include/haproxy/quic_tls.h

@@ -42,7 +42,8 @@ unsigned char initial_salt_v1[20] = {
 	0xcc, 0xbb, 0x7f, 0x0a
 };
 
-void quic_tls_keys_hexdump(struct buffer *buf, struct quic_tls_secrets *secs);
+void quic_tls_keys_hexdump(struct buffer *buf,
+                           const struct quic_tls_secrets *secs);
 
 void quic_tls_secret_hexdump(struct buffer *buf,
                              const unsigned char *secret, size_t secret_len);

include/haproxy/xprt_quic.h

@@ -114,7 +114,8 @@ static inline size_t quic_cid_saddr_cat(struct quic_cid *cid,
  * debugging purposes.
  * Always succeeds.
  */
-static inline void quic_cid_dump(struct buffer *buf, struct quic_cid *cid)
+static inline void quic_cid_dump(struct buffer *buf,
+                                 const struct quic_cid *cid)
 {
 	int i;
 

src/quic_tls.c

@@ -23,7 +23,8 @@ __attribute__((format (printf, 3, 4)))
 void hexdump(const void *buf, size_t buflen, const char *title_fmt, ...);
 
 /* Dump the RX/TX secrets of <secs> QUIC TLS secrets. */
-void quic_tls_keys_hexdump(struct buffer *buf, struct quic_tls_secrets *secs)
+void quic_tls_keys_hexdump(struct buffer *buf,
+                           const struct quic_tls_secrets *secs)
 {
 	int i;
 	size_t aead_keylen = (size_t)EVP_CIPHER_key_length(secs->aead);

src/xprt_quic.c

@@ -321,9 +321,7 @@ static void quic_trace(enum trace_level level, uint64_t mask, const struct trace
 			const ssize_t *room = a4;
 
 			if (qel) {
-				struct quic_pktns *pktns;
-
-				pktns = qc->pktns;
+				const struct quic_pktns *pktns = qc->pktns;
 				chunk_appendf(&trace_buf, " qel=%c cwnd=%llu ppif=%lld pif=%llu "
 				              "if=%llu pp=%u pdg=%d",
 				              quic_enc_level_char_from_qel(qel, qc),
@@ -422,9 +420,7 @@ static void quic_trace(enum trace_level level, uint64_t mask, const struct trace
 			const struct quic_enc_level *qel = a2;
 
 			if (qel) {
-				struct quic_pktns *pktns;
-
-				pktns = qc->pktns;
+				const struct quic_pktns *pktns = qc->pktns;
 				chunk_appendf(&trace_buf,
 				              " qel=%c state=%s ack?%d cwnd=%llu ppif=%lld pif=%llu if=%llu pp=%u pdg=%llu",
 				              quic_enc_level_char_from_qel(qel, qc),