Claude review: misc: fastrpc: Fix initial memory allocation for Audio PD memory pool

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

Patch Review

**Verdict: Looks good.**

The fix is correct. In the original code, `inbuf.pageslen` is unconditionally set to 0 *after* the remote heap allocation and SCM assignment block, so the DSP never receives the allocated buffer:

```c
// original: pageslen always 0
inbuf.client_id = fl->client_id;
inbuf.namelen = init.namelen;
inbuf.pageslen = 0;
```

The patch moves these assignments before the allocation block and sets `pageslen = 1` when the SCM assignment succeeds:

```c
+			scm_done = true;
+			inbuf.pageslen = 1;
```

This ensures the initially allocated buffer is actually registered with the Audio PD. The logic is clean: default `pageslen=0`, set to 1 only when memory is both allocated and SCM-assigned.

Note: This code is removed by patch 4, so this fix is primarily for stable backports.

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