squash some -Wunused-parameter warnings

diff --git a/plugin/core/gvrender_core_json.c b/plugin/core/gvrender_core_json.c
index c8cfdf8bc88338b9da0e561640bf3d6c7384da3f..df25e8ea03b2513cf10261128436ae19cc43df54 100644 (file)
--- a/plugin/core/gvrender_core_json.c
+++ b/plugin/core/gvrender_core_json.c
@@ -581,6 +581,8 @@ typedef struct {
 
 static void freef(Dt_t * dt, intm * obj, Dtdisc_t * disc)
 {
+    (void)dt;
+    (void)disc;
     free(obj->id);
     free(obj);
 }