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e799d2fca0
Async SSL socket SIGSEGV's sometimes when calling socket.close() while
send/recv. The issue was found here
https://github.com/nitely/nim-hyperx/pull/59.
Possibly related: #24024
This can occur when closing the socket while sending or receiving,
because `socket.sslHandle` is freed. The sigsegv can also occur on calls
that require `socket.bioIn` or `socket.bioOut` because those use
`socket.sslHandle` internally. This PR checks sslHandle is set before
doing any operation that requires it.
(cherry picked from commit 9ace1f97ac)