RDMA/qedr: Use NULL instead of 0 to represent a pointer

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Ram Amrani <Ram.Amrani@cavium.com>
Cc: Michal Kalderon <Michal.Kalderon@cavium.com>
Cc: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/qedr/qedr_roce_cm.c

@@ -660,7 +660,7 @@ int qedr_gsi_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
 						  dev->gsi_ll2_handle,
 						  wr->sg_list[0].addr,
 						  wr->sg_list[0].length,
-						  0 /* cookie */,
+						  NULL /* cookie */,
 						  1 /* notify_fw */);
 		if (rc) {
 			DP_ERR(dev,