Claude review: accel/ivpu: prevent uninitialized data bug in debugfs

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

Patch Review

**Verdict: Looks good.**

The fix adds a `*pos != 0` check to the existing early-return guard:

```c
-	if (size >= sizeof(buf))
+	if (*pos != 0 || size >= sizeof(buf))
 		return -EINVAL;
```

This is the right approach. The function expects a single complete write containing a formatted string like `"%u %u %u %u"` — partial/resumed writes at a non-zero offset would never produce correct results even if the buffer were properly initialized, since the `sscanf` on line 461 needs the full string from the beginning.

The pattern of rejecting `*pos != 0` is well-established in the kernel for debugfs write handlers that parse a complete user-space string in one shot (e.g., `dvfs_mode_fops_write` and similar handlers throughout the tree).

One minor observation: `simple_write_to_buffer` returns the number of bytes actually written (not necessarily equal to `size`), and that return value is used on line 460 as `buf[ret] = '\0'`. With the `*pos != 0` check in place, `ret` will always reflect bytes written starting from offset 0, so this is now fully correct.

**No issues found.** Clean, minimal, well-targeted fix with a proper Fixes tag.

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