[master] 1bb39901b fix another %s cast

[Nils Goroll]

commit 1bb39901bdca35cae2834be5642c0d92279645c7
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Sat Jan 16 13:09:52 2021 +0100

    fix another %s cast
    
    7da412fa4006eb48e4a31f00deac64cd763d0cd0 at work

diff --git a/vmod/vmod_debug_obj.c b/vmod/vmod_debug_obj.c
index 19386d985..266f4be6a 100644
--- a/vmod/vmod_debug_obj.c
+++ b/vmod/vmod_debug_obj.c
@@ -196,7 +196,7 @@ xyzzy_obj_test_priv_task(VRT_CTX, struct xyzzy_debug_obj *o, VCL_STRING s)
 		assert(p->methods == xyzzy_obj_test_priv_task_methods);
 		mylog(vsl, SLT_Debug,
 		    "%s.priv_task() = %p .priv = %p (\"%s\")",
-		    o->vcl_name, p, p->priv, p->priv);
+		    o->vcl_name, p, p->priv, (char *)p->priv);
 		return (p->priv);
 	}