crypto: marvell - remove set but not used variable 'index'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/crypto/marvell/hash.c: In function 'mv_cesa_ahash_pad_req':
drivers/crypto/marvell/hash.c:138:15: warning: variable 'index' set but not used [-Wunused-but-set-variable]

It's never used and can be removed.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/marvell/hash.c

@@ -135,11 +135,10 @@ static int mv_cesa_ahash_pad_len(struct mv_cesa_ahash_req *creq)
 
 static int mv_cesa_ahash_pad_req(struct mv_cesa_ahash_req *creq, u8 *buf)
 {
-	unsigned int index, padlen;
+	unsigned int padlen;
 
 	buf[0] = 0x80;
 	/* Pad out to 56 mod 64 */
-	index = creq->len & CESA_HASH_BLOCK_SIZE_MSK;
 	padlen = mv_cesa_ahash_pad_len(creq);
 	memset(buf + 1, 0, padlen - 1);