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

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