Upstream: consistent error handling after u->input_filter_init(). In all cases ngx_http_upstream_finalize_request() with NGX_ERROR now used. Previously used NGX_HTTP_INTERNAL_SERVER_ERROR in the subrequest in memory case don't cause any harm, but inconsistent with other uses.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  0
#endif

END