!3810 Some cleanup and bugfix for HNS3

Merge Pull Request from: @svishen 
 
This pr clean up some parameter initialization and fix some bug

There are several pointers are freed but not setted to NULL,
and their lifetime is not end immediately. To avoid misusing
there wild pointers, set them to NULL.

Removes several unnecessary variables initialization.

issue：
#I8PDAE:Some cleanup and bugfix for HNS3 
 
Link:https://gitee.com/openeuler/kernel/pulls/3810

 

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