fix exit status

acme-downloader.sh

@@ -202,14 +202,17 @@ if [[ -n $UPDATE ]]; then
         UPDATE_STATUS=$?
     fi
     if [ $UPDATE_STATUS == "skip" ]; then
+        EXIT_STATUS=0
         echo -e "\n$0 is already up to date\n"
     elif [ $UPDATE_STATUS -eq 0 ]; then
+        EXIT_STATUS=0
         echo -e "\n$0 updated successfully\n"
     else
+        EXIT_STATUS=$UPDATE_STATUS
         echo -e "\nfailed to update $0"
         echo -e "Please download the script manually from this URL: ${SCRIPT_URL}\n"
     fi
-    clean_up $UPDATE_STATUS
+    clean_up $EXIT_STATUS
 fi