On unstack, cleanup LVM setup for Cinder

Change-Id: I4f01dd65a4e5dd0dff33ea7c0024fb75fe83834b
diff --git a/clean.sh b/clean.sh
index cf24f27..92466c1 100755
--- a/clean.sh
+++ b/clean.sh
@@ -61,7 +61,7 @@
 cleanup_quantum
 cleanup_swift
 
-# cinder doesn't clean up the volume group as it might be used elsewhere...
+# cinder doesn't always clean up the volume group as it might be used elsewhere...
 # clean it up if it is a loop device
 VG_DEV=$(sudo losetup -j $DATA_DIR/${VOLUME_GROUP}-backing-file | awk -F':' '/backing-file/ { print $1}')
 if [[ -n "$VG_DEV" ]]; then