[DDP] Remove the duplicate parseHookResult in reducer (#59510)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/59510
Address the comment in https://github.com/pytorch/pytorch/pull/58937#discussion_r645822768
#Closes: https://github.com/pytorch/pytorch/issues/41266
ghstack-source-id: 130758758
Test Plan: waitforbuildbot
Reviewed By: cbalioglu
Differential Revision: D28918694
fbshipit-source-id: 7ac4e4e6268e220adefed230bdb377ab3b25e302
