TicketsBot/worker: bot/autoclose/autoclose.go; 41 LoC

Found a possible issue in [TicketsBot/worker](https://www.github.com/TicketsBot/worker) at [bot/autoclose/autoclose.go](https://github.com/TicketsBot/worker/blob/d32cf6ccef3a3e3ab13ca509091738ae7f3ee3f4/bot/autoclose/autoclose.go#L21-L61)

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 ticket used in defer or goroutine at line 24

[Click here to see the code in its original context.](https://github.com/TicketsBot/worker/blob/d32cf6ccef3a3e3ab13ca509091738ae7f3ee3f4/bot/autoclose/autoclose.go#L21-L61)

Click here to show the 41 line(s) of Go which triggered the analyzer.

```go
for ticket := range ch {
go func() {
// get worker
worker, err := buildContext(ticket, cache)
if err != nil {
sentry.Error(err)
return
}

// get ticket
ticket, err := dbclient.Client.Tickets.Get(ticket.TicketId, ticket.GuildId)
if err != nil {
sentry.Error(err)
return
}

// verify ticket exists + prevent potential panic
if ticket.ChannelId == nil {
return
}

// get self member
self, err := worker.GetGuildMember(ticket.GuildId, worker.BotId)
if err != nil {
// We are no longer in the guild and can exclude all tickets
if restError, ok := err.(request.RestError); ok && restError.ErrorCode == 403 {
if err := dbclient.Client.AutoCloseExclude.ExcludeAll(ticket.GuildId); err != nil {
sentry.Error(err)
}
}

sentry.Error(err)
return
}

// get premium status
premiumTier := utils.PremiumClient.GetTierByGuildId(ticket.GuildId, true, worker.Token, worker.RateLimiter)

logic.CloseTicket(worker, ticket.GuildId, *ticket.ChannelId, 0, self, &AutoCloseReason, true, premiumTier >= premium.Premium)
}()
}

```

Leave a reaction on this issue to contribute to the project by classifying this instance as a **Bug** :-1:, **Mitigated** :+1:, or **Desirable Behavior** :rocket:
See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: d32cf6ccef3a3e3ab13ca509091738ae7f3ee3f4