!812 [sync] PR-761: net: stmmac: fix potential double free of dma descriptor resources

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/761 
 
a double free problem in stmmac driver was triggered when doing mugen test,
After apply this patch the double free problem disappear. 
 
Link:https://gitee.com/openeuler/kernel/pulls/812

 

Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>