CLEANUP: haproxy: Free post_server_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 5965956..c3bc1f0 100644
--- a/src/haproxy.c
+++ b/src/haproxy.c
@@ -2607,6 +2607,7 @@
 	struct post_deinit_fct *pdf, *pdfb;
 	struct proxy_deinit_fct *pxdf, *pxdfb;
 	struct server_deinit_fct *srvdf, *srvdfb;
+	struct post_server_check_fct *pscf, *pscfb;
 
 	deinit_signals();
 	while (p) {
@@ -2907,6 +2908,11 @@
 		free(srvdf);
 	}
 
+	list_for_each_entry_safe(pscf, pscfb, &post_server_check_list, list) {
+		LIST_DEL(&pscf->list);
+		free(pscf);
+	}
+
 	vars_prune(&global.vars, NULL, NULL);
 	pool_destroy_all();
 	deinit_pollers();