Remove useless assignment

Author: feross

lib/server/swarm.js

@@ -73,7 +73,7 @@ Swarm.prototype._onAnnounceStarted = function (params, peer, id) {
 
   if (params.left === 0) this.complete += 1
   else this.incomplete += 1
-  peer = this.peers.set(id, {
+  this.peers.set(id, {
     type: params.type,
     complete: params.left === 0,
     peerId: params.peer_id, // as hex