HTreeMap: fix hashing
HTreeMap: fix hashing

SleimanJneidi/mapdb,jankotek/mapdb,sumit784/mapdb,jankotek/MapDB,pettermahlen/mapdb,lamfire/mapdb,cocosli/mapdb,jankotek/mapdb,hangum/mapdb,morfeo8marc/mapdb,ffjiao/mapdb,ringoluo/mapdb,binarytemple/mapdb,jankotek/MapDB,codeaudit/mapdb