BUG/MEDIUM: mux-h1: Remove H1C_F_WAIT_NEXT_REQ flag on a next request
When an idle H1 connection starts to process an new request, we must take
care to remove H1C_F_WAIT_NEXT_REQ flag. This flag is used to know an idle
H1 connection has already processed at least one request and is waiting for
a next one, but nothing was received yet.
Keeping this flag leads to a crash because some running H1 connections may
be erroneously released on a soft-stop. Indeed, only idle or closed
connections must be released.
This bug was reported into #1903. It is 2.7-specific. No backport needed.
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