perf(node, p2p): avoid unnecessary check len of map

[gzliudan]

Proposed changes

Even if the map is not initialized, we can use map[key] to check if the key is in map directly.

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

Impacted Components

Which part of the codebase this PR will touch base on,

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

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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
• N/A

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[Copilot]

Pull request overview

Removes redundant len(map) > 0 guards before blacklist membership checks, relying on Go’s safe lookup behavior for nil/empty maps.

Changes:

• Simplified blacklist rejection in inbound connection setup (p2p/server.go).
• Simplified blacklist rejection in admin RPC peer-add flows (node/api.go).

Reviewed changes

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

File	Description
p2p/server.go	Removes the len(srv.BlackPeers) > 0 wrapper and performs direct blacklist lookup during connection setup.
node/api.go	Removes len(server.BlackPeers) > 0 wrappers and performs direct blacklist lookup in AddPeer and AddTrustedPeer.

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