tests: Fix go vet warning
tests: Fix go vet warning

ejj/quilt-dev,kayousterhout/quilt,kayousterhout/quilt,LuiseV/quilt,ZhongtianWang/quilt,kklin/kelda,ejj/quilt-dev,akshayknarayan/quilt,stevenlin598/quilt,secant/quilt,stevenlin598/quilt,kayousterhout/quilt,quilt/quilt,kklin/kelda,kelda/kelda,stevenlin598/quilt,kklin/quilt,kklin/quilt,kelda/kelda,LuiseV/quilt,NetSys/quilt,ZhongtianWang/quilt,ZhongtianWang/quilt,kklin/quilt,stevenlin598/quilt,PenguinToast/quilt,NetSys/quilt,tejasmanohar/quilt,kklin/kelda,secant/quilt,ejj/quilt-dev,NetSys/quilt,mmussomele/quilt,secant/quilt,kayousterhout/quilt,stevenlin598/quilt,LuiseV/quilt,mmussomele/quilt,ejj/quilt-dev,NetSys/quilt,akshayknarayan/quilt,PenguinToast/quilt,tejasmanohar/quilt,akshayknarayan/quilt,LuiseV/quilt,NetSys/quilt,PenguinToast/quilt,quilt/quilt,PenguinToast/quilt,kelda/kelda,mmussomele/quilt,mmussomele/quilt,quilt/quilt,kklin/kelda,ZhongtianWang/quilt,secant/quilt,quilt/quilt,akshayknarayan/quilt,tejasmanohar/quilt,kklin/quilt,mmussomele/quilt,PenguinToast/quilt,tejasmanohar/quilt,kelda/kelda,LuiseV/quilt,secant/quilt,mmussomele/quilt,stevenlin598/quilt