BUG/MEDIUM: mux-h1: Be sure to have a conn_stream to set CS_FL_REOS in h1_recv

In the commit 6a2d33481 ("BUG/MEDIUM: h1: Set CS_FL_REOS if we had a read0."),
We set the flag CS_FL_REOS on the conn_stream when a read0 is detected. But we
must be sure to have a conn_stream first.
1 file changed