RDMA/ocrdma: remove unused discard_cnt variable

clang with W=1 reports
drivers/infiniband/hw/ocrdma/ocrdma_verbs.c:1592:6: error: variable
  'discard_cnt' set but not used [-Werror,-Wunused-but-set-variable]
        int discard_cnt = 0;
            ^
This variable is not used so remove it.
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20230326120959.1351948-1-trix@redhat.comSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/ocrdma/ocrdma_verbs.c

@@ -1589,7 +1589,6 @@ static void ocrdma_discard_cqes(struct ocrdma_qp *qp, struct ocrdma_cq *cq)
 {
 	unsigned long cq_flags;
 	unsigned long flags;
-	int discard_cnt = 0;
 	u32 cur_getp, stop_getp;
 	struct ocrdma_cqe *cqe;
 	u32 qpn = 0, wqe_idx = 0;
@@ -1641,7 +1640,6 @@ static void ocrdma_discard_cqes(struct ocrdma_qp *qp, struct ocrdma_cq *cq)
 		/* mark cqe discarded so that it is not picked up later
 		 * in the poll_cq().
 		 */
-		discard_cnt += 1;
 		cqe->cmn.qpn = 0;
 skip_cqe:
 		cur_getp = (cur_getp + 1) % cq->max_hw_cqe;