[caffe2][torch] Remove unreferenced local variable e (#71856)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71856
Fix this warning that flags on the MSVC build:
```
caffe2\torch\csrc\jit\frontend\tree_views.h(919): warning C4101: 'e': unreferenced local variable
```
Test Plan: CI
Reviewed By: jamesr66a
Differential Revision: D33784473
fbshipit-source-id: 83e84f419157da6a563f223e9488f8bef4046efb
(cherry picked from commit 5451aaa23ece11ca2b4e592b291f8754fe97a2d0)
