Chdir before removing the dir we are in

Change-Id: Ibc1b2bb41cdeed0c11a7d2491aecce89063e1b12
diff --git a/jjb/cloud-infra/prepare-for-test.sh b/jjb/cloud-infra/prepare-for-test.sh
index 7b9104b..d546e02 100644
--- a/jjb/cloud-infra/prepare-for-test.sh
+++ b/jjb/cloud-infra/prepare-for-test.sh
@@ -22,7 +22,7 @@
 set -o nounset
 
 echo "Info: Cloning infra/test repository"
-/bin/rm -rf $WORKSPACE
+cd $HOME && /bin/rm -rf $WORKSPACE
 git clone -q $TEST_REPO_URL $WORKSPACE
 
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