large_client_header_buffers did not free()ed before keep-alive

src/http/ngx_http_request.c

diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index 51ec46c..c04c6f9 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -2093,7 +2093,7 @@
 
     if (hc->free) {
         for (i = 0; i < hc->nfree; i++) {
-            ngx_pfree(c->pool, hc->free[i]);
+            ngx_pfree(c->pool, hc->free[i]->start);
             hc->free[i] = NULL;
         }
 
@@ -2105,7 +2105,7 @@
 
     if (hc->busy) {
         for (i = 0; i < hc->nbusy; i++) {
-            ngx_pfree(c->pool, hc->busy[i]);
+            ngx_pfree(c->pool, hc->busy[i]->start);
             hc->busy[i] = NULL;
         }