[strace/strace] fix modify_ldt failed beacause of no error info (#119)

[codecov[bot]]

# [Codecov](https://codecov.io/gh/strace/strace/pull/119?src=pr&el=h1) Report
> Merging [#119](https://codecov.io/gh/strace/strace/pull/119?src=pr&el=desc) into [master](https://codecov.io/gh/strace/strace/commit/2939bbd18adb6723f88774d36e8609b897664101?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/strace/strace/pull/119/graphs/tree.svg?width=650&token=Uoc5vM53zG&height=150&src=pr)](https://codecov.io/gh/strace/strace/pull/119?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   83.19%   83.19%           
=======================================
  Files         254      254           
  Lines       16639    16639           
  Branches      708      708           
=======================================
  Hits        13842    13842           
  Misses       2642     2642           
  Partials      155      155
```



------

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> Powered by [Codecov](https://codecov.io/gh/strace/strace/pull/119?src=pr&el=footer). Last update [2939bbd...1c730e0](https://codecov.io/gh/strace/strace/pull/119?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).


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