Fix incorrect growing of the IPv6 DHT.
Fix incorrect growing of the IPv6 DHT.

cfpp2p/dht,loadletter/dht256,raspopov/dht,tempbottle/dht-1,Librevault/dht,Erkan-Yilmaz/dht,gabrielfalcao/dht,jech/dht,mikedld/dht