HTTP/2: backed out 16905ecbb49e (ticket #822). It caused inconsistency between setting "in_closed" flag and the moment when the last DATA frame was actually read. As a result, the body buffer might not be initialized properly in ngx_http_v2_init_request_body(), which led to a segmentation fault in ngx_http_v2_state_read_data(). Also it might cause start processing of incomplete body. This issue could be triggered when the processing of a request was delayed, e.g. in the limit_req or auth_request modules.