crypto: lib/sha256 - return void

The SHA-256 / SHA-224 library functions can't fail, so remove the
useless return value.

Also long as the declarations are being changed anyway, also fix some
parameter names in the declarations to match the definitions.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c
index f2d7095..88156e3 100644
--- a/crypto/sha256_generic.c
+++ b/crypto/sha256_generic.c
@@ -35,27 +35,31 @@ EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
 
 static int crypto_sha256_init(struct shash_desc *desc)
 {
-	return sha256_init(shash_desc_ctx(desc));
+	sha256_init(shash_desc_ctx(desc));
+	return 0;
 }
 
 static int crypto_sha224_init(struct shash_desc *desc)
 {
-	return sha224_init(shash_desc_ctx(desc));
+	sha224_init(shash_desc_ctx(desc));
+	return 0;
 }
 
 int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
 			  unsigned int len)
 {
-	return sha256_update(shash_desc_ctx(desc), data, len);
+	sha256_update(shash_desc_ctx(desc), data, len);
+	return 0;
 }
 EXPORT_SYMBOL(crypto_sha256_update);
 
 static int crypto_sha256_final(struct shash_desc *desc, u8 *out)
 {
 	if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE)
-		return sha224_final(shash_desc_ctx(desc), out);
+		sha224_final(shash_desc_ctx(desc), out);
 	else
-		return sha256_final(shash_desc_ctx(desc), out);
+		sha256_final(shash_desc_ctx(desc), out);
+	return 0;
 }
 
 int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,