RDMA/rxe: Remove the unused xmit_errors member

The member variable xmit_errors can be replaced with

 rxe_counter_inc(rxe, RXE_CNT_SEND_ERR)

Link: https://lore.kernel.org/r/20211216054842.1099428-1-yanjun.zhu@linux.dev
Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/sw/rxe/rxe_net.c

@@ -440,7 +440,6 @@ int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
 	else
 		err = rxe_send(skb, pkt);
 	if (err) {
-		rxe->xmit_errors++;
 		rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);
 		return err;
 	}

drivers/infiniband/sw/rxe/rxe_verbs.h

@@ -392,8 +392,6 @@ struct rxe_dev {
 
 	struct net_device	*ndev;
 
-	int			xmit_errors;
-
 	struct rxe_pool		uc_pool;
 	struct rxe_pool		pd_pool;
 	struct rxe_pool		ah_pool;