net: cxgb3: remove redundant null pointer check before kfree_skb

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: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb3/cxgb3_offload.c

@@ -1302,8 +1302,7 @@ void cxgb3_offload_deactivate(struct adapter *adapter)
 	rcu_read_unlock();
 	RCU_INIT_POINTER(tdev->l2opt, NULL);
 	call_rcu(&d->rcu_head, clean_l2_data);
-	if (t->nofail_skb)
-		kfree_skb(t->nofail_skb);
+	kfree_skb(t->nofail_skb);
 	kfree(t);
 }