Logic error when failed to fetch stream

[LaurenceJJones]

https://github.com/crowdsecurity/lua-cs-bouncer/blob/902f0550235828898cb9540bb9e0d48acd7121de/lib/crowdsec.lua#LL227C1-L236C1

Logic error here should be something like

  if not res then
    error("request failed: ".. err)
    local ok, err = ngx.timer.at(runtime.conf["UPDATE_FREQUENCY"], stream_query)
    set_refreshing(false)
    if not ok then
      error("Failed to create the timer: " .. (err or "unknown"))
    end
  end

Edit: to add more context the current code may cause a nil error since the err variable is override by the call to ngx.timer so it best we call the error before we call ngx.timer