crypto: ccp - use crypto_shash_tfm_digest()

Instead of manually allocating a 'struct shash_desc' on the stack and
calling crypto_shash_digest(), switch to using the new helper function
crypto_shash_tfm_digest() which does this for us.

Cc: Tom Lendacky <[e-mail]>
Signed-off-by: Eric Biggers <[e-mail]>
Acked-by: Tom Lendacky <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/ccp/ccp-crypto-sha.c

···
 {
 	struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ahash_tfm(tfm));
 	struct crypto_shash *shash = ctx->u.sha.hmac_tfm;
-
-	SHASH_DESC_ON_STACK(sdesc, shash);
-
 	unsigned int block_size = crypto_shash_blocksize(shash);
 	unsigned int digest_size = crypto_shash_digestsize(shash);
 	int i, ret;
···
 
 	if (key_len > block_size) {
 		/* Must hash the input key */
-		sdesc->tfm = shash;
-
-		ret = crypto_shash_digest(sdesc, key, key_len,
-					  ctx->u.sha.key);
+		ret = crypto_shash_tfm_digest(shash, key, key_len,
+					      ctx->u.sha.key);
 		if (ret)
 			return -EINVAL;