Hi, all:

nginx code version: 1.7.9 ( I have checked v1.9.0, no change about this)

The bufs used to invoke ngx_event_pipe_remove_shadow_links in
ngx_event_pipe_read_upstream come from p->preread_bufs or p->free_raw_bufs
or new allocated buf.

Both p->preread_bufs and new allocated buf have no shadow link.

p->preread_bufs is inited to be NULL, and there are two places which will
add free buffer into it: ngx_event_pipe_write_chain_to_temp_file and
ngx_event_pipe_write_to_downstream.

In both places, shadow links are cleared by ngx_event_pipe_add_free_buf or
by ngx_event_pipe_remove_shadow_links.

So, there is no need to call ngx_event_pipe_remove_shadow_links
in ngx_event_pipe_read_upstream at all, for shadow link will always be NULL.

Am I missing something ? Or just lack of code review ?
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