crypto: adiantum - Only access common skcipher fields on spawn

As skcipher spawns may be of the type lskcipher, only the common
fields may be accessed.  This was already the case but use the
correct helpers to make this more obvious.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/adiantum.c

@@ -468,7 +468,7 @@ static void adiantum_free_instance(struct skcipher_instance *inst)
  * Check for a supported set of inner algorithms.
  * See the comment at the beginning of this file.
  */
-static bool adiantum_supported_algorithms(struct skcipher_alg *streamcipher_alg,
+static bool adiantum_supported_algorithms(struct skcipher_alg_common *streamcipher_alg,
 					  struct crypto_alg *blockcipher_alg,
 					  struct shash_alg *hash_alg)
 {
@@ -494,7 +494,7 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
 	const char *nhpoly1305_name;
 	struct skcipher_instance *inst;
 	struct adiantum_instance_ctx *ictx;
-	struct skcipher_alg *streamcipher_alg;
+	struct skcipher_alg_common *streamcipher_alg;
 	struct crypto_alg *blockcipher_alg;
 	struct shash_alg *hash_alg;
 	int err;
@@ -514,7 +514,7 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
 				   crypto_attr_alg_name(tb[1]), 0, mask);
 	if (err)
 		goto err_free_inst;
-	streamcipher_alg = crypto_spawn_skcipher_alg(&ictx->streamcipher_spawn);
+	streamcipher_alg = crypto_spawn_skcipher_alg_common(&ictx->streamcipher_spawn);
 
 	/* Block cipher, e.g. "aes" */
 	err = crypto_grab_cipher(&ictx->blockcipher_spawn,
@@ -578,8 +578,8 @@ static int adiantum_create(struct crypto_template *tmpl, struct rtattr **tb)
 	inst->alg.decrypt = adiantum_decrypt;
 	inst->alg.init = adiantum_init_tfm;
 	inst->alg.exit = adiantum_exit_tfm;
-	inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(streamcipher_alg);
-	inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(streamcipher_alg);
+	inst->alg.min_keysize = streamcipher_alg->min_keysize;
+	inst->alg.max_keysize = streamcipher_alg->max_keysize;
 	inst->alg.ivsize = TWEAK_SIZE;
 
 	inst->free = adiantum_free_instance;