[LTP] [PATCH 1/2] kernel/syscalls: Modify incorrect use of TERRNO and replace functions with safe_macros

[Xie Ziyao]

Hi, Petr,

>> - modify some incorrect use of TERRNO/TTERRNO in kernel/syscalls;
I just re-checked the latest code and submit the v2 version.

Please see: 
https://patchwork.ozlabs.org/project/ltp/patch/20210511082644.110124-1-xieziyao@huawei.com/

>> - replace functions with safe_macros to check the return value in kernel/syscalls.
As for this type of modification, I'll try to use script to replace all 
of them.

> These two would be really better to put 2 commits.
> 
> Kind regards,
> Petr
> .
> 

Thanks for your review.

Kind Regards,
Ziyao