BUG/MEDIUM: mux-h1: Add connection error handling when reading/sending on a pipe

There is no error handling when we read or write on a pipe. There error is
caught later, in the mux I/O handler. But there is no reason to not do so
here.

There is no reason to backport it because no issue was reported for now
because of this "bug". In all cases, it must be evaluated first.
1 file changed