Claude review: drm/omapdrm: Switch private_obj initialization to atomic_create_state

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

Patch Review

**Commit message**: Clear and well-written.

**Code review**:

The new `omap_global_atomic_create_state()` is clean and correct:

```c
static struct drm_private_state *
omap_global_atomic_create_state(struct drm_private_obj *obj)
{
	struct omap_global_state *state;

	state = kzalloc_obj(*state);
	if (!state)
		return ERR_PTR(-ENOMEM);

	__drm_atomic_helper_private_obj_create_state(obj, &state->base);

	return &state->base;
}
```

Simple and follows the pattern correctly. Since `omap_global_state` has no additional resources to initialize (just `kzalloc` is sufficient), this is the minimal correct implementation.

**Same issue: Missing return value check:**

```c
	drm_atomic_private_obj_init(dev, &priv->glob_obj, NULL,
				    &omap_global_state_funcs);
	return 0;
```

This should propagate the return value of `drm_atomic_private_obj_init()` instead of unconditionally returning 0.

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