Claude review: drm: renesas: rz-du: rzg2l_du_encoder: convert to of_drm_find_and_get_bridge()

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

Patch Review

**Status: Good to merge.**

This is the simpler of the two patches since `bridge` is purely a local variable with no long-lived storage.

**Refcounting analysis:**

*Panel-bridge path:*
- `devm_drm_panel_bridge_add_typed()` returns a bridge with one devres-managed reference
- `drm_bridge_get(bridge)` takes a second reference for the `__free` to put at function exit
- `drm_bridge_attach()` takes its own reference (per the earlier work in step 1.D)
- On success: `__free` puts the `drm_bridge_get` reference; attach holds its own; devres holds its own. Balanced.

*of_drm_find_and_get_bridge path:*
- `of_drm_find_and_get_bridge()` returns with one reference
- `drm_bridge_attach()` takes another
- On success: `__free` puts the find reference; attach holds its own. Balanced.

*Error paths:*
```c
if (IS_ERR(bridge))
    return PTR_ERR(no_free_ptr(bridge));
```
`no_free_ptr()` nullifies `bridge` before the `__free` cleanup runs, correctly preventing `drm_bridge_put()` from being called on an `ERR_PTR`. This is correct.

The `!bridge` (NULL) return path from `of_drm_find_and_get_bridge` is also safe since `DEFINE_FREE` checks `if (_T)`.

**Comment quality:** The comment explaining the extra `drm_bridge_get()` is clear and helpful.

No issues.

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