sws: fix potential OOB write

[vszakats]

Found by Codex Security

Follow-up to 0aaebf6

[Copilot]

Pull request overview

Fixes a potential out-of-bounds write in the sws test server by ensuring reads into the request buffer always leave room for a NUL terminator when logging/storing received websocket traffic.

Changes:

• Adjusted websocket traffic sread() length calculation to reserve 1 byte for '\0'.

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[vszakats]

augment review

[augmentcode]

🤖 Augment PR Summary

Summary: Fixes a potential out-of-bounds write in the sws test server when reading upgraded (websocket) traffic into the request buffer.

Changes:

• Adjusts the `sread()` length calculation to leave space for a terminating NUL byte before later writing `reqbuf[req->offset] = '\0'`

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[augmentcode]

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