[CRYPTO] hmac: Fix hmac_init update call

The crypto_hash_update call in hmac_init gave the number 1
instead of the length of the sg list in bytes.  This is a
missed conversion from the digest => hash change.

As tcrypt only tests crypto_hash_digest it didn't catch this.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

crypto/hmac.c

@@ -98,7 +98,7 @@ static int hmac_init(struct hash_desc *pdesc)
 	sg_set_buf(&tmp, ipad, bs);
 
 	return unlikely(crypto_hash_init(&desc)) ?:
-	       crypto_hash_update(&desc, &tmp, 1);
+	       crypto_hash_update(&desc, &tmp, bs);
 }
 
 static int hmac_update(struct hash_desc *pdesc,