mm/swap: submit the last readahead batch before unplugging

Since block swap I/O is batched in struct swap_iocb, swap_add_folio() only
appends a folio to the pending batch when its slot directly follows the
previous one, and submits the pending batch otherwise.  Batches submitted
inside the readahead loop go through the plug, where the block layer can
still merge them, but the final batch is submitted after blk_finish_plug()
and always becomes a separate request.

So submit the final batch before finishing the plug.

Link: https://lore.kernel.org/20261001085730.2029773-1-alex@ghiti.fr
Fixes: dda8fb68b590 ("mm/swap: also use struct swap_iocb for block I/O")
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Chris Li <chrisl@kernel.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kemeng Shi <shikemeng@huaweicloud.com>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: Barry Song <baohua@kernel.org>
Cc: Youngjun Park <youngjun.park@lge.com>

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