RDMA/nes: Fix slab corruption

Referencing cm_node after it is freed via rem_ref_cm_node() causes a
slab corruption.  There is no need to set cm_node->cm_id to NULL in
mini_cm_close().

Signed-off-by: Chien Tung <ctung@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index d69226d..2caf9da 100644
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/drivers/infiniband/hw/nes/nes_cm.c
@@ -2029,7 +2029,6 @@
 		ret = rem_ref_cm_node(cm_core, cm_node);
 		break;
 	}
-	cm_node->cm_id = NULL;
 	return ret;
 }