[CI]fix for lint CI

[MrZ20]

What this PR does / why we need it?

fix lint CI

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.13.0
• vLLM main: vllm-project/vllm@2c24bc6

[github-actions]

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[gemini-code-assist]

Code Review

This pull request applies a formatting fix to resolve a linting issue in vllm_ascend/platform.py. The change refactors a long if condition into multiple lines for better readability, without altering any functionality. While reviewing the change, I noticed a potential bug in the logic that constructs the PYTORCH_NPU_ALLOC_CONF environment variable, which could lead to a malformed value. I've added a comment with a suggestion to fix it. Otherwise, the formatting change is correct.

[gemini-code-assist]

The current logic for appending ,expandable_segments:True can lead to a malformed environment variable if PYTORCH_NPU_ALLOC_CONF is an empty string. In that case, npu_alloc_configs would become ',expandable_segments:True', which is likely incorrect due to the leading comma. It's better to handle the case where npu_alloc_configs is empty separately.

Suggested change

	npu_alloc_configs += ",expandable_segments:True"
	if npu_alloc_configs:
	npu_alloc_configs += ",expandable_segments:True"
	else:
	npu_alloc_configs = "expandable_segments:True"