Claude review: drm/exec: Make the drm_exec_until_all_locked() macro more readable

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Looks good overall.** Using `__UNIQUE_ID` is cleaner than the `__PASTE(__drm_exec_, __LINE__)` approach, and `__maybe_unused` is more idiomatic than `(void)`.

The refactoring into a `__drm_exec_until_all_locked` helper macro is well structured:

```c
#define __drm_exec_until_all_locked(exec, _label)
_label:
	for (void * __maybe_unused __drm_exec_retry_ptr; ({
		__drm_exec_retry_ptr = &&_label;
		drm_exec_cleanup(exec);
	});)
```

One nit: the commit message says "althrough" — should be "although".

This also makes the `drm_exec_until_all_locked` macro simpler:
```c
#define drm_exec_until_all_locked(exec)
	__drm_exec_until_all_locked(exec, __UNIQUE_ID(drm_exec))
```

Splitting the label generation from the loop logic is a readability improvement.

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