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BUG/MEDIUM: stream: Prevent mux upgrades if client connection is no l…
…onger ready If an early error occurred on the client connection, we must prevent any multiplexer upgrades. Indeed, it is unexpected for a mux to be initialized with no xprt. On a normal workflow it is impossible. So it is not an issue. But if a mux upgrade is performed at the stream level, an early error on the connection may have already been handled by the previous mux and the connection may be already fully closed. If the mux upgrade is still performed, a crash can be experienced. It is possible to have a crash with an implicit TCP>HTTP upgrade if there is no data in the input buffer. But it is also possible to get a crash with an explicit "switch-mode http" rule. It must be backported to all stable versions. In 2.2, the patch must be applied directly in stream_set_backend() function.
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