SplitHTTP server: Fix panic during concurrent Close and Push #3593
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When Close and Push are called concurrently, it may happen that Push attempts to write to an already-closed channel, and trigger a panic.
From a user perspective, it results in logs like this:
It's probably triggered when download is closed at the same time an upload packet is submitted.
These panics don't crash the server and the inbound is still usable.