crypto: aegis - use the new scatterwalk functions

Use scatterwalk_next() which consolidates scatterwalk_clamp() and
scatterwalk_map(), and use scatterwalk_done_src() which consolidates
scatterwalk_unmap(), scatterwalk_advance(), and scatterwalk_done().

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Author: ebiggers

crypto/aegis128-core.c

@@ -284,10 +284,10 @@ static void crypto_aegis128_process_ad(struct aegis_state *state,
 
 	scatterwalk_start(&walk, sg_src);
 	while (assoclen != 0) {
-		unsigned int size = scatterwalk_clamp(&walk, assoclen);
+		unsigned int size;
+		const u8 *mapped = scatterwalk_next(&walk, assoclen, &size);
 		unsigned int left = size;
-		void *mapped = scatterwalk_map(&walk);
-		const u8 *src = (const u8 *)mapped;
+		const u8 *src = mapped;
 
 		if (pos + size >= AEGIS_BLOCK_SIZE) {
 			if (pos > 0) {
@@ -308,9 +308,7 @@ static void crypto_aegis128_process_ad(struct aegis_state *state,
 
 		pos += left;
 		assoclen -= size;
-		scatterwalk_unmap(mapped);
-		scatterwalk_advance(&walk, size);
-		scatterwalk_done(&walk, 0, assoclen);
+		scatterwalk_done_src(&walk, mapped, size);
 	}
 
 	if (pos > 0) {