CLEANUP: remove obsolete comments

This patch removes some old comments introduced by
13a9232ebc63fdf357ffcf4fa7a1a5e77a1eac2b.
Those comments are related to issues already fixed.
diff --git a/src/dns.c b/src/dns.c
index bbc4f4a..3e52e17 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -1030,7 +1030,6 @@
 
 	/* now parsing additional records */
 	nb_saved_records = 0;
-	//TODO: check with Dinko for DNS poisoning
 	for (i = 0; i < dns_p->header.arcount; i++) {
 		if (reader >= bufend)
 			return DNS_RESP_INVALID;
@@ -1202,7 +1201,6 @@
 					continue;
 				tmp_record->ar_item = dns_answer_record;
 			}
-			//TODO: there is a leak for now, since we don't clean up AR records
 
 			LIST_ADDQ(&dns_p->ar_list, &dns_answer_record->list);
 		}