fix variable shadowing issus (#19567)

Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19567

fix variable shadowing

Reviewed By: bddppq, wx1988

Differential Revision: D15032114

fbshipit-source-id: 895ea21f22b87db8c7c8684f54fa186d22f24d10
diff --git a/caffe2/opt/optimize_ideep.cc b/caffe2/opt/optimize_ideep.cc
index 0175a8b..d770479 100644
--- a/caffe2/opt/optimize_ideep.cc
+++ b/caffe2/opt/optimize_ideep.cc
@@ -748,8 +748,8 @@
 
     bool is_op_found = false;
     auto seqNode = consumers.front();
-    for (int i = 0; i < op_list.size(); i++) {
-      if (isOpType(seqNode, op_list[i])) {
+    for (int j = 0; j < op_list.size(); j++) {
+      if (isOpType(seqNode, op_list[j])) {
         is_op_found = true;
         break;
       }