zebra: unlock route-node in dplane results handler

Unlock the route-node struct we look up while processing
async dataplane results.

Signed-off-by: Mark Stapp <mjs@voltanet.io>

zebra/zebra_rib.c

@@ -1879,6 +1879,8 @@ static void rib_process_result(struct zebra_dplane_ctx *ctx)
 		goto done;
 	}
 
+	route_unlock_node(rn);
+
 	srcdest_rnode_prefixes(rn, &dest_pfx, &src_pfx);
 
 	op = dplane_ctx_get_op(ctx);