Fix infinite loop in del_post_hook #21914
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Stack:
:black_circle: #21914 Fix infinite loop in del_post_hook 💛
#21591 added a needed feature to clean up grad accumulator post hooks when the DistributedDataParallel model object is cleaned up. There's a minor typo that causes it to loop infinitely over the first element.
Differential Revision: D15878884