BUG/MINOR: httpclient: process the response when received before the end of the request

A server could reply a response with a shut before the end of the htx
transfer, in this case the httpclient would leave before computing the
received response.

This patch fixes the issue by calling the "process_data" label instead of
the "more" label which don't do the si_shut.

Must be bacported in 2.5.
1 file changed