!890 ethtool: ioctl: fix potential NULL deref in ethtool_set_coalesce()

Merge Pull Request from: @ci-robot 
 
PR sync from:  Zhengchao Shao <shaozhengchao@huawei.com>
 https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/thread/RD4XA3AJYG55M6DKC5CSK5O2Z4JJWDPF/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/890

 

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