BUG/MINOR: stream-int: Fix si_cs_recv() return value

The previous patch on this function (36b536d6c "BUG/MEDIUM: stream-int: Don't
loose events on the CS when an EOS is reported") contains a bug. The return
value is based on the conn-stream's flags. But it may be reset if the CS is
closed. Ironically it was exactly the purpose of this patch...

This patch must be backported to 2.0 and 1.9.
1 file changed