Re: [PATCH 0/1] MR6698: wined3d: Check that format_id is >= 0 before assuming it's an index.

[Alexandre Julliard (＠julliard)]

This causes a warning with clang:

```
dlls/wined3d/utils.c:1936:19: warning: result of comparison of unsigned enum expression >= 0 is always true [-Wtautological-unsigned-enum-zero-compare]
```