Claude review: drm: of: forbid bridge-only calls to drm_of_find_panel_or_bridge()

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

Patch Review

**Status: Good**

Now that all bridge-only callers have been converted, this patch:

1. Adds `WARN_ON(!panel)` to catch any remaining or new bridge-only callers
2. Simplifies the code by removing the `if (panel)` guards (since panel is now mandatory)
3. Updates the kdoc to reflect `@panel` must not be NULL and recommends `of_drm_get_bridge_by_endpoint()` for bridge-only lookups

The `if (bridge)` guard is kept since `@bridge` is still optional (callers that only want a panel can pass `NULL` for bridge). The kdoc change is clear and the code simplification is correct.

---

**Summary:** The series is in good shape. The only blocking issue is the `return -ENODEV;` → `return ERR_PTR(-ENODEV);` fix needed in the non-OF stub in patch 2. Everything else looks correct, with consistent conversion patterns and proper refcount handling throughout.

---
Generated by Claude Code Patch Reviewer