modify for security check

ge/graph/passes/cond_remove_pass.cc

@@ -82,6 +82,7 @@ Status CondRemovePass::Run(NodePtr &node) {
 
 Status CondRemovePass::RemoveDeadCondLink(const int32_t index, const NodePtr &node) {
   const auto &in_anchor = node->GetInDataAnchor(index);
+  GE_CHECK_NOTNULL(in_anchor);
   const auto &peerout_anchor = in_anchor->GetPeerOutAnchor();
   if (GraphUtils::RemoveEdge(peerout_anchor, in_anchor) != SUCCESS) {
     GELOGE(FAILED, "Remove edge from node %s index %d to node %s index %d.",