fix broken memory problem on keepalived connection #1823
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…ormational response on one keepalived connection
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When h2o receives continuous multiple informational responses from upstream, and handle those on one HTTP/1.1 keep-alive downstream connection, h2o may refer broken memory (used for prior request). If it happens it causes broken response, and may causes other problems.
This bug was introduced by #1727. The cause of the bug is forgetting initializing st_h2o_http1_finalostream_t.