RDMA/bnxt_re: Remove set but not used variable 'dev_attr'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/infiniband/hw/bnxt_re/ib_verbs.c: In function 'bnxt_re_create_gsi_qp':
drivers/infiniband/hw/bnxt_re/ib_verbs.c:1283:30: warning:
 variable 'dev_attr' set but not used [-Wunused-but-set-variable]

commit 8dae419f ("RDMA/bnxt_re: Refactor queue pair creation code")
involved this, but not used, so remove it.

Link: https://lore.kernel.org/r/20200227064542.91205-1-yuehaibing@huawei.comReported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -1280,14 +1280,12 @@ static int bnxt_re_create_shadow_gsi(struct bnxt_re_qp *qp,
 static int bnxt_re_create_gsi_qp(struct bnxt_re_qp *qp, struct bnxt_re_pd *pd,
 				 struct ib_qp_init_attr *init_attr)
 {
-	struct bnxt_qplib_dev_attr *dev_attr;
 	struct bnxt_re_dev *rdev;
 	struct bnxt_qplib_qp *qplqp;
 	int rc = 0;
 
 	rdev = qp->rdev;
 	qplqp = &qp->qplib_qp;
-	dev_attr = &rdev->dev_attr;
 
 	qplqp->rq_hdr_buf_size = BNXT_QPLIB_MAX_QP1_RQ_HDR_SIZE_V2;
 	qplqp->sq_hdr_buf_size = BNXT_QPLIB_MAX_QP1_SQ_HDR_SIZE_V2;