remove unnecessary length check

gossipsub.go

@@ -1032,14 +1032,12 @@ func (gs *GossipSubRouter) heartbeat() {
 					return !inMesh && !doBackoff && !direct && gs.score.Score(p) > medianScore
 				})
 
-				if len(plst) != 0 {
 				for _, p := range plst {
 					log.Debugf("HEARTBEAT: Opportunistically graft peer %s on topic %s", p, topic)
 					graftPeer(p)
 				}
 			}
 		}
-		}
 
 		// 2nd arg are mesh peers excluded from gossip. We already push
 		// messages to them, so its redundant to gossip IHAVEs.