crypto: adiantum - Use memcpy_{to,from}_sglist()

Call the newer, easier-to-read functions memcpy_to_sglist() and
memcpy_from_sglist() directly instead of calling
scatterwalk_map_and_copy().  No change in behavior.

Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://lore.kernel.org/r/20251211011846.8179-9-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

Author: Eric Biggers

crypto/adiantum.c

@@ -427,8 +427,8 @@ static int adiantum_finish(struct skcipher_request *req)
 		/* Slow path that works for any destination scatterlist */
 		adiantum_hash_message(req, dst, &digest);
 		le128_sub(&rctx->rbuf.bignum, &rctx->rbuf.bignum, &digest);
-		scatterwalk_map_and_copy(&rctx->rbuf.bignum, dst,
-					 bulk_len, sizeof(le128), 1);
+		memcpy_to_sglist(dst, bulk_len, &rctx->rbuf.bignum,
+				 sizeof(le128));
 	}
 	return 0;
 }
@@ -477,8 +477,8 @@ static int adiantum_crypt(struct skcipher_request *req, bool enc)
 	} else {
 		/* Slow path that works for any source scatterlist */
 		adiantum_hash_message(req, src, &digest);
-		scatterwalk_map_and_copy(&rctx->rbuf.bignum, src,
-					 bulk_len, sizeof(le128), 0);
+		memcpy_from_sglist(&rctx->rbuf.bignum, src, bulk_len,
+				   sizeof(le128));
 	}
 	le128_add(&rctx->rbuf.bignum, &rctx->rbuf.bignum, &rctx->header_hash);
 	le128_add(&rctx->rbuf.bignum, &rctx->rbuf.bignum, &digest);