[ONOS-7580] Fix the clean-up script malfunction

Change-Id: Ief9cad341bad9fc927f588f71773872af0e84370
diff --git a/jjb/OnosSystemTest/vm-bm-clean-up.sh b/jjb/OnosSystemTest/vm-bm-clean-up.sh
index 47b5839..c633cd9 100644
--- a/jjb/OnosSystemTest/vm-bm-clean-up.sh
+++ b/jjb/OnosSystemTest/vm-bm-clean-up.sh
@@ -6,8 +6,8 @@
 
 if [ $? -eq 0 ]
 then
-   echo "Checking if there are logs older than ${{DAYS_OLD}} days...."
-   for i in $(find . -mtime +${{DAYS_OLD}} -type d)
+   echo "Checking if there are logs older than ${DAYS_OLD} days...."
+   for i in $(find . -mtime +${DAYS_OLD} -type d)
    do
    echo -e "DIRs older than $DAYS_OLD are: "
    echo $i