Gzip Gunzip: always flush busy bufs when the incoming chain is NULL.

[Yichun Zhang (agentzh)]

Hello!

On Mon, Nov 3, 2014 at 2:03 PM, Maxim Dounin wrote:
>
> The change is 1.7.7 is intentional, please see
> http://hg.nginx.org/nginx/rev/973fded4f461.
>

Yes, I was aware of this commit. This commit introduces real issues on
my side because even if the gzip filter does not have busy bufs, the
downstream write filter can have busy bufs. And it's wrong to avoid
flushing downstream busy bufs just when ngx_gzip itself does not have
busy bufs.

Regards,
-agentzh