In the transition to end game it's likely that we'll send an uniterest

message followed by an interest message. Optimize this but not sending
those messages in that case. This is better becasue we don't risk to
trigger a choke from the receiving peer.

btpd/peer.c

@@ -180,8 +180,13 @@ peer_want(struct peer *p, uint32_t index)
     assert(p->nwant < p->npieces);
     p->nwant++;
     if (p->nwant == 1) {
+	int unsent = 0;
+	struct nb_link *nl = BTPDQ_LAST(&p->outq, nb_tq);
+	if (nl != NULL && nl->nb->type == NB_UNINTEREST)
+	    unsent = peer_unsend(p, nl);
+	if (!unsent)
+	    peer_send(p, btpd.interest_msg);
 	p->flags |= PF_I_WANT;
-	peer_send(p, btpd.interest_msg);
     }
 }