mlx5: Remove a set-but-not-used variable

This has been detected by building the mlx5 driver with W=1.

Fixes: 1a412fb1 ('net/mlx5: Fixes: 1a412fb1 (IB/mlx5: Modify QP
commands via mlx5 ifc')
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Eli Cohen <eli@mellanox.com>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mlx5/qp.c

@@ -2657,7 +2657,6 @@ static int __mlx5_ib_modify_qp(struct ib_qp *ibqp,
 	struct mlx5_ib_port *mibport = NULL;
 	enum mlx5_qp_state mlx5_cur, mlx5_new;
 	enum mlx5_qp_optpar optpar;
-	int sqd_event;
 	int mlx5_st;
 	int err;
 	u16 op;
@@ -2804,12 +2803,6 @@ static int __mlx5_ib_modify_qp(struct ib_qp *ibqp,
 	if (qp->rq.wqe_cnt && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
 		context->db_rec_addr = cpu_to_be64(qp->db.dma);
 
-	if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD	&&
-	    attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
-		sqd_event = 1;
-	else
-		sqd_event = 0;
-
 	if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
 		u8 port_num = (attr_mask & IB_QP_PORT ? attr->port_num :
 			       qp->port) - 1;