coinexchain/onvakv: store/fuzz/fuzz.go; 29 LoC

Found a possible issue in [coinexchain/onvakv](https://www.github.com/coinexchain/onvakv) at [store/fuzz/fuzz.go](https://github.com/coinexchain/onvakv/blob/19f53210214c60f123d3b6d3229feff48417df1c/store/fuzz/fuzz.go#L564-L592)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

> range-loop variable i used in defer or goroutine at line 578

[Click here to see the code in its original context.](https://github.com/coinexchain/onvakv/blob/19f53210214c60f123d3b6d3229feff48417df1c/store/fuzz/fuzz.go#L564-L592)

Click here to show the 29 line(s) of Go which triggered the analyzer.

```go
for i, epoch := range block.EpochList {
if DBG {fmt.Printf("Check h:%d (%v) epoch %d of %d\n", height, block.Succeed, i, len(block.EpochList))}
dbList := make([]storetypes.MultiStoreI, len(epoch.TxList))
var wg sync.WaitGroup
for j, tx := range epoch.TxList {
if cfg.TestRabbit {
dbList[j] = rabbit.NewRabbitStore(trunk)
} else {
dbList[j] = trunk.Cached()
}
if DBG {fmt.Printf("Check h:%d (%v) epoch %d tx %d (%v) of %d\n", height, block.Succeed, i, j, tx.Succeed, len(epoch.TxList))}
if inParallel {
wg.Add(1)
go func(tx *Tx, j int) {
CheckTx(height, i, j, dbList[j], tx, rs, cfg, block.Succeed)
wg.Done()
}(tx, j)
} else {
CheckTx(height, i, j, dbList[j], tx, rs, cfg, block.Succeed)
}

}
if inParallel {wg.Wait()}
for j, tx := range epoch.TxList {
if DBG {fmt.Printf("WriteBack %d-%d tx %d : %v\n", height, i, j, tx.Succeed)}
dbList[j].Close(tx.Succeed)
//showTrunk(trunk, i, j, tx.Succeed, block.Succeed)
}
}

```

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commit ID: 19f53210214c60f123d3b6d3229feff48417df1c