Claude review: drm: Suppress intentional warning backtraces in scaling unit tests

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

Patch Review

**Clean and minimal.** This wraps the drm_rect_calc_hscale/vscale calls in `kunit_warning_suppress(test)` blocks.

```c
+	kunit_warning_suppress(test) {
+		scaling_factor = drm_rect_calc_hscale(&params->src, &params->dst,
+						      params->min_range,
+						      params->max_range);
+	}
```

**Minor observation:** The suppression is applied unconditionally to all parameterized test cases, including those where the parameters are valid and no warning would fire. This is harmless (suppression has negligible overhead since the check only happens in the warn slow path), but it means the counter would be 0 for non-warning cases. This is fine — suppressing when no warning fires is cheaper than conditionally wrapping.

**Minor nit:** The comment says "This affects all unit tests with an error code in expected_scaling_factor" — it would be slightly more precise to say "negative" rather than "error code", but this is a matter of taste.

---
Generated by Claude Code Patch Reviewer