Remove an accidental copy in a range-based for loop (#48234)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48234
This was copying the iterator varaible instead of taking a reference.
Fix the trivial error here.
Test Plan:
clang11 catches this and throws a warning that we promote with
-Werror. This change fixes the error.
Reviewed By: smeenai
Differential Revision: D24970929
fbshipit-source-id: 335a1b53276467987bc27fa41326803e01e70c01
