Claude review: drm/bridge: th1520-dw-hdmi: Fix error check on dw_hdmi_probe() return value

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

Patch Review

**Verdict: Correct, good fix.**

The original code was:
```c
hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
if (IS_ERR(hdmi))
    return PTR_ERR(hdmi);
```

This is wrong because `hdmi` is the `struct th1520_hdmi *` allocated earlier via `devm_kzalloc()` — it's always a valid kernel pointer, never an ERR_PTR. The error encoding from `dw_hdmi_probe()` is stored in `hdmi->dw_hdmi`, so `IS_ERR(hdmi)` would always be false, causing the driver to silently proceed with an error pointer stored in `hdmi->dw_hdmi`, leading to crashes later.

The fix correctly checks `hdmi->dw_hdmi`:
```c
if (IS_ERR(hdmi->dw_hdmi))
    return PTR_ERR(hdmi->dw_hdmi);
```

No issues. Fixes tag and commit message are accurate.

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