【FIx】修复积分产品下单后库存增加的问题

app/Http/Controllers/Api/Score/Orders.php

@@ -64,7 +64,7 @@ class Orders extends Api{
 		// 写入数据
 		try {
 			// 扣减库存
-			$result 					= $Product->edit($productId,['stock'=>DB::raw('stock+'.$buyNum)]);
+			$result 					= $Product->edit($productId,['stock'=>DB::raw('stock+-'.$buyNum)]);
 			// 如果扣减失败
 			if( !$result )				{
 				// 回退数据