blk-crypto: use BLK_STS_INVAL for alignment errors

Make __blk_crypto_bio_prep() propagate BLK_STS_INVAL when IO segments
fail the data unit alignment check.

This was flagged by an LTP test that expects EINVAL when performing an
O_DIRECT read with a misaligned buffer [1].

Cc: Eric Biggers <ebiggers@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/all/aP-c5gPjrpsn0vJA@google.com/ [1]
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Reviewed-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Carlos Llamas

block/blk-crypto.c

@@ -292,7 +292,7 @@ bool __blk_crypto_bio_prep(struct bio **bio_ptr)
 	}
 
 	if (!bio_crypt_check_alignment(bio)) {
-		bio->bi_status = BLK_STS_IOERR;
+		bio->bi_status = BLK_STS_INVAL;
 		goto fail;
 	}