crypto: chelsio - remove set but not used variable 'kctx_len'

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

drivers/crypto/chelsio/chcr_ipsec.c: In function 'chcr_ipsec_xmit':
drivers/crypto/chelsio/chcr_ipsec.c:674:33: warning:
 variable 'kctx_len' set but not used [-Wunused-but-set-variable]
  unsigned int flits = 0, ndesc, kctx_len;

It not used since commit 8362ea16 ("crypto: chcr - ESN for Inline IPSec Tx")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/chelsio/chcr_ipsec.c

@@ -671,7 +671,7 @@ int chcr_ipsec_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct ipsec_sa_entry *sa_entry;
 	u64 *pos, *end, *before, *sgl;
 	int qidx, left, credits;
-	unsigned int flits = 0, ndesc, kctx_len;
+	unsigned int flits = 0, ndesc;
 	struct adapter *adap;
 	struct sge_eth_txq *q;
 	struct port_info *pi;
@@ -682,7 +682,6 @@ int chcr_ipsec_xmit(struct sk_buff *skb, struct net_device *dev)
 		return NETDEV_TX_BUSY;
 
 	sa_entry = (struct ipsec_sa_entry *)x->xso.offload_handle;
-	kctx_len = sa_entry->kctx_len;
 
 	if (skb->sp->len != 1) {
 out_free:       dev_kfree_skb_any(skb);