Squashfs: Ensure all readahead pages have been used

In the recent work to remove page->index, a sanity check
that ensured all the readhead pages were covered by the
Squashfs data block was removed [1].

To avoid any regression, this commit adds the sanity check
back in an equivalent way.  Namely the page actor will now
return error if any pages are unused after completion.

[1] https://lore.kernel.org/all/[email protected]/

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Signed-off-by: Phillip Lougher <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
V3: last_page should be actor->last_page
Signed-off-by: Christian Brauner <[email protected]>

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