修复一个小bug

src/main/java/com/example/afrishop_v3/controllers/CartController.java

@@ -73,7 +73,7 @@ public class CartController extends Controller {
                             record.setCheckFlag(0);
                             itemCount = 0;
                             if (itemCount != 0)
-                                record.setItemCount(itemCount);
+                                record.setItemNum(itemCount);
                         }
                         result.setData(itemCount);
                         result.setMessage("Out of stock");