Claude review: drm/bridge: drm_bridge_get/put(): document NULL pointer behaviour

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

Patch Review

The patch updates the `@bridge` parameter documentation for both `drm_bridge_get()` and `drm_bridge_put()` from:

```
- * @bridge: DRM bridge
+ * @bridge: DRM bridge; if NULL this function does nothing
```

**Correctness:** Verified against the implementation. Both functions have an `if (bridge)` guard (lines 294 and 310 of `drm_bridge.c`), so the documentation accurately describes the behavior.

**Motivation:** Well explained in the commit message — there's existing code that relies on this (e.g., `__free(drm_bridge_put)` cleanup patterns at lines 1042, 1166, 1230), and callers should be able to depend on it without ambiguity.

**Nit:** For `drm_bridge_get()`, it might be worth also noting the return value in the NULL case (returns NULL), since the function has a documented `Returns: Pointer to @bridge` — but this is minor and the current wording is consistent with how similar kernel APIs (like `kfree`) document their NULL tolerance.

**Reviewed-by: No issues found.**

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