BUG/MINOR: channel: compare to_forward with buf->i, not buf->size

We know that all incoming data are going to be purged if to_forward
is greater than them, not only if greater than the buffer size. This
buf has no direct impact on this version, but it participates to some
bugs affecting http-send-name-header since 1.4. This fix will have to
be backported down to 1.4 albeit in a different form.
(cherry picked from commit bb3f994f1a379289534c4ccf0f790df7b69d2611)
1 file changed