CLEANUP: haproxy: Free post_deinit_list in deinit()

This allocation is technically always reachable and cannot leak, but so are
a few others that *are* freed.
diff --git a/src/haproxy.c b/src/haproxy.c
index a297c8b..88a1c97 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -2604,7 +2604,7 @@
 	struct logformat_node *lf, *lfb;
 	struct bind_conf *bind_conf, *bind_back;
 	struct build_opts_str *bol, *bolb;
-	struct post_deinit_fct *pdf;
+	struct post_deinit_fct *pdf, *pdfb;
 	struct proxy_deinit_fct *pxdf, *pxdfb;
 	struct server_deinit_fct *srvdf;
 
@@ -2897,6 +2897,11 @@
 		free(pxdf);
 	}
 
+	list_for_each_entry_safe(pdf, pdfb, &post_deinit_list, list) {
+		LIST_DEL(&pdf->list);
+		free(pdf);
+	}
+
 	vars_prune(&global.vars, NULL, NULL);
 	pool_destroy_all();
 	deinit_pollers();