automated: linux: pi-stress: fix indentation

Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
diff --git a/automated/linux/pi-stress/pi-stress.sh b/automated/linux/pi-stress/pi-stress.sh
index 6ad0d17..938e3e6 100755
--- a/automated/linux/pi-stress/pi-stress.sh
+++ b/automated/linux/pi-stress/pi-stress.sh
@@ -26,7 +26,7 @@
         D) DURATION="${OPTARG}" ;;
         m) MLOCKALL="${OPTARG}" ;;
         r) RR="${OPTARG}" ;;
-	w) BACKGROUND_CMD="${OPTARG}" ;;
+        w) BACKGROUND_CMD="${OPTARG}" ;;
         *) usage ;;
     esac
 done