several changes in cache cleanup handling: *) now ngx_http_file_cache_cleanup() uses ngx_http_file_cache_free() *) ngx_http_file_cache_free() interface has been changed to accept r->cache ngx_http_file_cache_cleanup() must use r->cache, but not r, because there can be several r->cache's during request processing, r->cache may be NULL at request finalising, etc. *) test if updating request does not complete correctly