remove duplicate code within cleanup_dist_env_and_memory

[andyxning]

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

Purpose

The code is duplicated with destroy_model_parallel in

vllm/vllm/distributed/parallel_state.py

Lines 1234 to 1235 in 6d98843

	if torch.distributed.is_initialized():
	torch.distributed.destroy_process_group()

.

cleanup_dist_env_and_memory will first call destroy_model_parallel and destroy_model_parallel will call torch.distributed.destroy_process_group. So, i think the code is duplicated and should be cleaned.

/cc @comaniac

Test Plan

NA

Test Result

NA

(Optional) Documentation Update

NA

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[gemini-code-assist]

Code Review

This pull request removes a redundant call to torch.distributed.destroy_process_group() within the cleanup_dist_env_and_memory function. The call is already made inside destroy_distributed_environment(), which is invoked just before. The change is a good cleanup and improves code clarity by eliminating duplicated logic. The logic appears sound and I don't see any potential issues with this refactoring.

[DarkLight1337]

Thanks for the cleanup!

[DarkLight1337]

Can you merge from main to see if the CI failure is resolved?