Restore debug message removed by mistake

Also while at it, fix debug level for existing DEBUG_RET: errors should
always be level 1.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index db2e2e3..f607e36 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -1392,7 +1392,7 @@
                                                PSA_HASH_MAX_SIZE,
                                                &hash_len);
     if (ret != 0) {
-        MBEDTLS_SSL_DEBUG_RET(4, "mbedtls_ssl_get_handshake_transcript", ret);
+        MBEDTLS_SSL_DEBUG_RET(1, "mbedtls_ssl_get_handshake_transcript", ret);
         return ret;
     }
 
@@ -1403,6 +1403,9 @@
 
     hash_len += 4;
 
+    MBEDTLS_SSL_DEBUG_BUF(4, "Truncated handshake transcript",
+                          hash_transcript, hash_len);
+
     /* Reset running hash and replace it with a hash of the transcript */
     ret = mbedtls_ssl_reset_checksum(ssl);
     if (ret != 0) {