Claude review: misc: fastrpc: Move fdlist to invoke context structure

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

Patch Review

**Overall: Looks good.**

This patch moves the `fdlist` pointer from being recalculated in `fastrpc_put_args()` to being stored in `struct fastrpc_invoke_ctx`. The pointer is computed once in `fastrpc_get_args()` and reused later.

The correctness relies on `ctx->nscalars` equaling `inbufs + outbufs + handles` — which is confirmed by the `REMOTE_SCALARS_LENGTH` macro definition:

```c
ctx->fdlist = (u64 *)(pages + ctx->nscalars);
```

This is equivalent to the original:
```c
fdlist = (uint64_t *)(pages + inbufs + outbufs + handles);
```

The cleanup of the now-unused `outbufs`, `handles`, `list`, and `pages` variables in `fastrpc_put_args()` is correct. One minor nit: the patch also removes the blank line after `int ret = 0;` — this creates an empty blank line before the `for` loop, which is fine but cosmetic.

**No issues found.**

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