Upstream: upstream argument in ngx_http_upstream_process_request().
Upstream: upstream argument in ngx_http_upstream_process_request().

In case of filter finalization, r->upstream might be changed during
the ngx_event_pipe() call.  Added an argument to preserve it while
calling the ngx_http_upstream_process_request() function.

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx