square/beancounter: accounter/accounter.go; 19 LoC

Found a possible issue in [square/beancounter](https://www.github.com/square/beancounter) at [accounter/accounter.go](https://github.com/square/beancounter/blob/22bd81ac6ce3b51fc2833e4ae79ef527989428ae/accounter/accounter.go#L190-L208)

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.

> reference to hash is reassigned at line 205

[Click here to see the code in its original context.](https://github.com/square/beancounter/blob/22bd81ac6ce3b51fc2833e4ae79ef527989428ae/accounter/accounter.go#L190-L208)

Click here to show the 19 line(s) of Go which triggered the analyzer.

```go
for hash, tx := range a.transactions {
for _, txin := range tx.vin {
prev, exists := a.transactions[txin.prevHash]
if !exists {
continue
}
if int(txin.index) >= len(prev.vout) {
panic("prev index > vouts")
}
if prev.vout[txin.index].ours {
balance -= prev.vout[txin.index].value
if prev.vout[txin.index].spentBy != nil {
// sanity check: an output can only be spent by one transaction.
log.Panicf("%s and %s, both spending %s", hash, *prev.vout[txin.index].spentBy, txin.prevHash)
}
prev.vout[txin.index].spentBy = &hash
}
}
}

```

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commit ID: 22bd81ac6ce3b51fc2833e4ae79ef527989428ae