[Bug analyzer/123981] -Wanalyzer-null-dereference does not consider __seg_gs

[auto at fedang dot net via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123981

--- Comment #1 from auto at fedang dot net ---
I made a small typo while copying the code (inverted __seg_gs and *):

```
#define getgs() ((int __seg_gs *)0)
```

The warning is unchanged.