crypto: ccree - remove set but not used variable 'du_size'

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

drivers/crypto/ccree/cc_cipher.c: In function 'cc_setup_state_desc':
drivers/crypto/ccree/cc_cipher.c:536:15: warning:
 variable 'du_size' set but not used [-Wunused-but-set-variable]

commit 5c83e8ec ("crypto: ccree - fix FDE descriptor sequence")
involved this unused variable, so remove it.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/ccree/cc_cipher.c

@@ -533,14 +533,6 @@ static void cc_setup_state_desc(struct crypto_tfm *tfm,
 	int flow_mode = ctx_p->flow_mode;
 	int direction = req_ctx->gen_ctx.op_type;
 	dma_addr_t iv_dma_addr = req_ctx->gen_ctx.iv_dma_addr;
-	unsigned int du_size = nbytes;
-
-	struct cc_crypto_alg *cc_alg =
-		container_of(tfm->__crt_alg, struct cc_crypto_alg,
-			     skcipher_alg.base);
-
-	if (cc_alg->data_unit)
-		du_size = cc_alg->data_unit;
 
 	switch (cipher_mode) {
 	case DRV_CIPHER_ECB: