fix minor goroutine leakage
fix minor goroutine leakage

zachgersh/atc,zachgersh/atc,zachgersh/atc,savaki/atc,utako/atc,pivotal-devin-fallak/atc,savaki/atc,simonjjones/atc,utako/atc,simonjjones/atc,pivotal-devin-fallak/atc,utako/atc,savaki/atc,pivotal-devin-fallak/atc,simonjjones/atc,zachgersh/atc