Claude review: uapi: Provide DIV_ROUND_CLOSEST()

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

Patch Review

**Status: Looks good**

Clean mechanical refactoring moving `DIV_ROUND_CLOSEST()` to a uapi-accessible location as `__KERNEL_DIV_ROUND_CLOSEST()`.

The switch from `typeof` to `__typeof__` is good practice for uapi headers. The commit message's claim about "building ISO C applications" is slightly loose since the statement expression `({...})` syntax is itself a GCC extension, but `__typeof__` is the correct choice for uapi.

Minor style nit: the replacement alias has no blank line separating it from the next comment block:

```c
+#define DIV_ROUND_CLOSEST __KERNEL_DIV_ROUND_CLOSEST
 /*
  * Same as above but for u64 dividends. divisor must be a 32-bit
```

A blank line between the `#define` and the `/*` comment would improve readability, though this is existing context so may not be worth a respin.

The uapi placement in `include/uapi/linux/const.h` next to the existing `__KERNEL_DIV_ROUND_UP` is appropriate. Tags look solid (Acked-by Andy Shevchenko, Reviewed-by Angelo).

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