cloudreve/Cloudreve: models/scripts/storage.go; 11 LoC

Found a possible issue in [cloudreve/Cloudreve](https://www.github.com/cloudreve/Cloudreve) at [models/scripts/storage.go](https://github.com/cloudreve/Cloudreve/blob/61e6d9b591a6416067d0ea935b9e9aba28e5c468/models/scripts/storage.go#L26-L36)

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.

> function call which takes a reference to user at line 34 may start a goroutine

[Click here to see the code in its original context.](https://github.com/cloudreve/Cloudreve/blob/61e6d9b591a6416067d0ea935b9e9aba28e5c468/models/scripts/storage.go#L26-L36)

Click here to show the 11 line(s) of Go which triggered the analyzer.

```go
for _, user := range res {
// 计算正确的容量
var total storageResult
model.DB.Model(&model.File{}).Where("user_id = ?", user.ID).Select("sum(size) as total").Scan(&total)
// 更新用户的容量
if user.Storage != total.Total {
util.Log().Info("将用户 [%s] 的容量由 %d 校准为 %d", user.Email,
user.Storage, total.Total)
model.DB.Model(&user).Update("storage", total.Total)
}
}

```

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commit ID: 61e6d9b591a6416067d0ea935b9e9aba28e5c468