Fix a static code checker warning:
drivers/crypto/chelsio/chcr_algo.c:3681
 chcr_aead_op() warn: passing zero to 'PTR_ERR'
Fixes: 2debd3325e55 ("crypto: chcr - Add AEAD algos.")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
        /* Form a WR from req */
        skb = create_wr_fn(req, u_ctx->lldi.rxq_ids[a_ctx(tfm)->rx_qidx], size);
 
-       if (IS_ERR(skb) || !skb) {
+       if (IS_ERR_OR_NULL(skb)) {
                chcr_dec_wrcount(cdev);
-               return PTR_ERR(skb);
+               return PTR_ERR_OR_ZERO(skb);
        }
 
        skb->dev = u_ctx->lldi.ports[0];