BUG/MEDIUM: mux-h2: report no available stream on a connection having errors

If an H2 mux has met an error, we must not report available streams
anymore, or it risks to accumulate new streams while not being able
to process them.

This should be backported to 2.0 and 1.9.

(cherry picked from commit c61966f9b468b72528f854f4bc64bb5934751384)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed