ssh: dedupe state change function

[vszakats]

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[vszakats]

@aisle-analyzer

[aisle-research-bot]

🔒 Aisle Security Analysis

✅ We scanned this PR and did not find any security vulnerabilities.
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Analyzed PR: #20473 at commit 3b609a4

[icing]

I had plans to change the libssh2 implementation by adding a connection filter. Which would (will?) require changes to the state handling, so this code will diverge. But since this is just a pipe dream for now, no objections from me.