blk-mq: return actual keyslot error in blk_insert_cloned_request()

To avoid hiding information, pass on the error code from
blk_crypto_rq_get_keyslot() instead of always using BLK_STS_IOERR.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230315183907.53675-2-ebiggers@kernel.org


Signed-off-by: Jens Axboe <axboe@kernel.dk>