fix delete condition

app/routes.py

@@ -17,7 +17,7 @@ def get_and_check_share(share_id, decrease_limit=False) -> Share:
     if share.download_limit and decrease_limit:
         share.download_limit -= 1
         db.session.commit()
-    if (share.download_limit and share.download_limit < 0) or\
+    if (share.download_limit and share.download_limit <= 0) or\
             (share.expires is not None and datetime.now() > share.expires):
         que.enqueue(delete_share, share.id)
         return None
@@ -134,7 +134,7 @@ def media(share_id, filename):
 
 @app.route('/d/<string:share_id>zip')
 def zip_attachments(share_id):
-    share = get_and_check_share(share_id)
+    share = get_and_check_share(share_id, decrease_limit=True)
     if share is None: return redirect(url_for('expired'))
     if share.password:
         if share_id not in session: