fix: stream creation when connections are nil

[richard-ramos]

No description provided.

[Copilot]

Pull request overview

This pull request fixes a race condition in stream creation by ensuring proper nil checks when a connection is closed. The fix addresses a scenario where makeStream could be called on a connection that has been closed but not yet fully cleaned up, preventing potential crashes or undefined behavior.

Changes:

• Set lsquicConn to nil in connection close callbacks to mark the underlying connection as invalid
• Add nil checks in makeStream to raise ConnectionClosedError when attempting to create a stream on a closed connection
• Update makeStream signature to properly declare it raises ConnectionClosedError

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
lsquic/context/server.nim	Set lsquicConn to nil in server's onConnClosed callback
lsquic/context/client.nim	Set lsquicConn to nil in client's onConnClosed callback
lsquic/context/context.nim	Add nil checks and error handling in makeStream procedure

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