Use crypto_shash_digest() instead of crypto_shash_init() followed by
crypto_shash_finup().  (For simplicity only; they are equivalent.)
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
        desc->tfm = tfm;
        desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 
-       ret = crypto_shash_init(desc);
-       if (ret < 0)
-               goto error_2;
-       might_sleep();
-       ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, sig->digest);
+       ret = crypto_shash_digest(desc, cert->tbs, cert->tbs_size, sig->digest);
        if (ret < 0)
                goto error_2;