kfree_skb has taken the null pointer into account. hence it is safe
to remove the redundant null pointer check before kfree_skb.
Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
 
        return;
 out:
-       if (skb)
-               kfree_skb(skb);
+       kfree_skb(skb);
 }
 
 static void release_tcp_port(struct sock *sk)
 
        for (i = 0; i < (1 << RSPQ_HASH_BITS); i++)
                kfree_skb(cdev->rspq_skb_cache[i]);
        kfree(cdev->lldi);
-       if (cdev->askb)
-               kfree_skb(cdev->askb);
+       kfree_skb(cdev->askb);
        kfree(cdev);
 }