axe old flag remained after ancient "post_accept_timeout" directive

src/http/ngx_http_request.c

diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index b3eab7e..03dc68b 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -990,10 +990,9 @@
     }
 
     if (n == NGX_AGAIN) {
-        if (!r->header_timeout_set) {
+        if (!rev->timer_set) {
             cscf = ngx_http_get_module_srv_conf(r, ngx_http_core_module);
             ngx_add_timer(rev, cscf->client_header_timeout);
-            r->header_timeout_set = 1;
         }
 
         if (ngx_handle_read_event(rev, 0) == NGX_ERROR) {

src/http/ngx_http_request.h

diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index db1292b..9073be9 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -427,8 +427,6 @@
     unsigned                          fast_subrequest:1;
     unsigned                          subrequest_in_memory:1;
 
-    unsigned                          header_timeout_set:1;
-
     unsigned                          gzip:2;
 
     unsigned                          proxy:1;