RDMA/qedr: Remove Unneeded variable rc

Fix the below warning reported by coccicheck:

drivers/infiniband/hw/qedr/verbs.c:2454:5-7: Unneeded variable: "rc".
Return "0" on line 2499

Link: https://lore.kernel.org/r/20190716173712.GA12949@hari-Inspiron-1545Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Acked-by: Michal Kalderon <michal.kalderon@marvell.com>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/qedr/verbs.c

@@ -2451,7 +2451,6 @@ int qedr_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
 	struct qedr_dev *dev = qp->dev;
 	struct ib_qp_attr attr;
 	int attr_mask = 0;
-	int rc = 0;
 
 	DP_DEBUG(dev, QEDR_MSG_QP, "destroy qp: destroying %p, qp type=%d\n",
 		 qp, qp->qp_type);
@@ -2496,7 +2495,7 @@ int qedr_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
 		xa_erase_irq(&dev->qps, qp->qp_id);
 		kfree(qp);
 	}
-	return rc;
+	return 0;
 }
 
 int qedr_create_ah(struct ib_ah *ibah, struct rdma_ah_attr *attr, u32 flags,