Remove unnecessary statement in `capture_stderr` (#52366)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/52366
Test Plan: Imported from OSS
Reviewed By: jamesr66a
Differential Revision: D26489602
Pulled By: ansley
fbshipit-source-id: dd0db0a631840b5efd5dc48887fbf724781c6be4
