crypto: chelsio - fix a type cast error

fix a type cast error for queue descriptor
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Atul Gupta <atul.gupta@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/chelsio/chcr_ipsec.c

@@ -423,7 +423,7 @@ inline void *copy_key_cpltx_pktxt(struct sk_buff *skb,
 			memcpy(pos, sa_entry->key, left);
 			memcpy(q->q.desc, sa_entry->key + left,
 			       key_len - left);
-			pos = q->q.desc + (key_len - left);
+			pos = (u8 *)q->q.desc + (key_len - left);
 		}
 	}
 	/* Copy CPL TX PKT XT */