CLEANUP: haproxy: Free post_check_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 0dc81c7..e70870a 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -2407,6 +2407,7 @@
 	struct per_thread_alloc_fct *taf, *tafb;
 	struct per_thread_free_fct *tff, *tffb;
 	struct post_server_check_fct *pscf, *pscfb;
+	struct post_check_fct *pcf, *pcfb;
 	struct post_proxy_check_fct *ppcf, *ppcfb;
 
 	deinit_signals();
@@ -2722,6 +2723,11 @@
 		free(srvdf);
 	}
 
+	list_for_each_entry_safe(pcf, pcfb, &post_check_list, list) {
+		LIST_DEL(&pcf->list);
+		free(pcf);
+	}
+
 	list_for_each_entry_safe(pscf, pscfb, &post_server_check_list, list) {
 		LIST_DEL(&pscf->list);
 		free(pscf);