Claude review: drm/meson: clean up KMS polling on register failure

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

Patch Review

**Correctness: Correct.**

The initialization sequence in `meson_drv_bind_master()` is:

```c
// line 343: request_irq(priv->vsync_irq, ...)
// line 349: drm_kms_helper_poll_init(drm)
// line 353: drm_dev_register(drm, 0)
```

The error unwind must be in reverse order: poll_fini → free_irq. The patch achieves this correctly:

```c
uninstall_poll:
	drm_kms_helper_poll_fini(drm);
uninstall_irq:
	free_irq(priv->vsync_irq, drm);
```

This also matches the normal teardown order in `meson_drv_unbind()` (lines 406-409), which does `drm_dev_unregister` → `drm_kms_helper_poll_fini` → `free_irq`.

**Fixes tag:** The `Fixes:` tag references `bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")`, which is the commit that introduced this function. This is appropriate since the bug has existed since the original code.

**Stable tag:** The `Cc: stable@vger.kernel.org` tag is appropriate for a resource-leak/use-after-free fix on an error path.

**No issues found.** The patch is minimal, correct, and well-described. The commit message accurately explains the problem and the fix.

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