Remove naked returns from leveldb/db_util.go.
Remove naked returns from leveldb/db_util.go.

syndtr/goleveldb,hustbill/goleveldb,FactomProject/goleveldb,rentongzhang/goleveldb,chai2010/goleveldb,trigrass2/goleveldb,conseweb/goleveldb,ngaut/goleveldb,zzl0/goleveldb,btcsuite/goleveldb,no2key/goleveldb