refactor(core/txpool/legacypool): simplify LegacyPool.Get nil path #34092

[gzliudan]

Proposed changes

Return pool.get(hash) directly instead of redundant nil checks.

Ref: ethereum#34092

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
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[Copilot]

Pull request overview

This PR simplifies LegacyPool.Get in the legacy txpool by removing a redundant nil-check and returning the underlying lookup result directly, aligning with the existing get helper’s contract.

Changes:

• Simplify LegacyPool.Get to return pool.get(hash) without an intermediate variable and explicit nil-branch.

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