MT#55283 Report queue full as error

When using recording via the proc interface, this error indicates that
the client (rtpengine-recording) is not reading the stream data fast
enough.

Closes #1676

Change-Id: I8a0d04745edb0e166f74d8ab5e8b979667f7f108

kernel-module/xt_RTPENGINE.c

@@ -3480,7 +3480,7 @@ static void add_stream_packet(struct re_stream *stream, struct re_stream_packet
 
 	/* discard older packets */
 	while (stream->list_count > stream->info.max_packets) {
-		DBG("discarding old packet from queue\n");
+		log_err("Queue is full, discarding old packet from queue");
 		packet = list_first_entry(&stream->packet_list, struct re_stream_packet, list_entry);
 		list_del(&packet->list_entry);
 		list_add(&packet->list_entry, &delete_list);