client queue race fix from @mleinart in #400
client queue race fix from @mleinart in #400

johnseekins/carbon,krux/carbon,kharandziuk/carbon,xadjmerripen/carbon,JeanFred/carbon,graphite-project/carbon,xadjmerripen/carbon,pratX/carbon,criteo-forks/carbon,kharandziuk/carbon,deniszh/carbon,iain-buclaw-sociomantic/carbon,JeanFred/carbon,piotr1212/carbon,pu239ppy/carbon,mleinart/carbon,johnseekins/carbon,obfuscurity/carbon,obfuscurity/carbon,mleinart/carbon,pu239ppy/carbon,pratX/carbon,deniszh/carbon,criteo-forks/carbon,krux/carbon,piotr1212/carbon,graphite-project/carbon,iain-buclaw-sociomantic/carbon