!1651 Fix missing dealloc_dfx_cnt() during device unregister

Merge Pull Request from: @stinft 
 
https://gitee.com/openeuler/kernel/issues/I7PDHP 
 
Link:https://gitee.com/openeuler/kernel/pulls/1651 

Reviewed-by: Chengchang Tang <tangchengchang@huawei.com> 
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com> 

drivers/infiniband/hw/hns/hns_roce_main.c

@@ -1500,6 +1500,7 @@ void hns_roce_exit(struct hns_roce_dev *hr_dev, bool bond_cleanup)
 	hns_roce_cmd_cleanup(hr_dev);
 	if (hr_dev->hw->cmq_exit)
 		hr_dev->hw->cmq_exit(hr_dev);
+	hns_roce_dealloc_dfx_cnt(hr_dev);
 }
 
 MODULE_LICENSE("Dual BSD/GPL");