[master] 4e6abff8d missing cast

[Nils Goroll]

commit 4e6abff8df324c0c5428b1821a1caca7674a0aff
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Wed Jan 13 17:43:48 2021 +0100

    missing cast
    
    Ref: 6b3e26c7d42c204fae134a1b6dc73c9ac885ed3b

diff --git a/vmod/vmod_debug_obj.c b/vmod/vmod_debug_obj.c
index 803e9146c..097a74f99 100644
--- a/vmod/vmod_debug_obj.c
+++ b/vmod/vmod_debug_obj.c
@@ -256,7 +256,7 @@ xyzzy_obj_test_priv_top(VRT_CTX, struct xyzzy_debug_obj *o, VCL_STRING s)
 		assert(p->methods == xyzzy_obj_test_priv_top_methods);
 		VSLb(ctx->vsl, SLT_Debug,
 		    "%s.priv_top() = %p .priv = %p (\"%s\")",
-		    o->vcl_name, p, p->priv, p->priv);
+		     o->vcl_name, p, p->priv, (char *)p->priv);
 		return (p->priv);
 	}