style(p2p): changed if-else blocks to conform with golint #16660

[gzliudan]

Proposed changes

Ref: ethereum#16660

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• Bugfix (non-breaking change which fixes an issue)
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• CICD Improvement

Impacted Components

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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
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
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[Copilot]

Pull request overview

This PR refactors if-else blocks in the p2p package to conform with golint standards by removing unnecessary else blocks when the if branch contains a return statement. This follows the Go best practice of using early returns to reduce nesting.

Changes:

• Refactored executeConnEvent function in p2p/simulations/network.go to use early return pattern
• Refactored ExpectMsg function in p2p/message.go to use early return pattern

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
p2p/simulations/network.go	Removed unnecessary else block in executeConnEvent, using early return when connection is up
p2p/message.go	Removed unnecessary else block in ExpectMsg, using early return when content is nil

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