crypto: chtls - remove the redundant check in chtls_recvmsg()

A warning message reported by a static analysis tool:
  "
  Either the condition 'if(skb)' is redundant or there is possible null
  pointer dereference: skb.
  "

Remove the unused redundant check.
Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/chelsio/chtls/chtls_io.c

@@ -1841,7 +1841,6 @@ int chtls_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 			tp->urg_data = 0;
 
 		if (avail + offset >= skb->len) {
-			if (likely(skb))
 			chtls_free_skb(sk, skb);
 			buffers_freed++;