[PATCH] use signed value when comparing timer with 0 and check lingering_time setting

[lanshun zhou]

In ngx_http_lingering_close_handler
and ngx_http_discarded_request_body_handler, there's risk
that r->lingering_time is smaller than ngx_time(), then comparing timer
which is a unsigned value  with zero will never return true. This can cause
long time connection for some kind of requests (For example, lingering_time
is set smaller than lingering_timeout)
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