RDMA/cxgb4: 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>
Acked-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/cxgb4/cm.c

@@ -403,7 +403,6 @@ void _c4iw_free_ep(struct kref *kref)
 				 ep->com.local_addr.ss_family);
 		dst_release(ep->dst);
 		cxgb4_l2t_release(ep->l2t);
-		if (ep->mpa_skb)
 		kfree_skb(ep->mpa_skb);
 	}
 	if (!skb_queue_empty(&ep->com.ep_skb_list))

drivers/infiniband/hw/cxgb4/qp.c

@@ -2813,7 +2813,6 @@ struct ib_srq *c4iw_create_srq(struct ib_pd *pd, struct ib_srq_init_attr *attrs,
 	free_srq_queue(srq, ucontext ? &ucontext->uctx : &rhp->rdev.uctx,
 		       srq->wr_waitp);
 err_free_skb:
-	if (srq->destroy_skb)
 	kfree_skb(srq->destroy_skb);
 err_free_srq_idx:
 	c4iw_free_srq_idx(&rhp->rdev, srq->idx);