dm crypt: remove unused io_pool and _crypt_io_pool
The previous commit ("dm crypt: don't allocate pages for a partial request") stopped using the io_pool slab mempool and backing _crypt_io_pool kmem cache. Signed-off-by: NMikulas Patocka <mpatocka@redhat.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com>
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