fix metal related CI stuff

Author: bssrdf

tests/test-conv3d.cpp

@@ -120,7 +120,6 @@ void load_model(test_model & model, int ic, int oc, int iw, int ih, int id,
 #ifdef GGML_USE_METAL
     if (use_gpu) {
         fprintf(stderr, "%s: using Metal backend\n", __func__);
-        ggml_backend_metal_log_set_callback(ggml_log_callback_default, nullptr);
         model.backend = ggml_backend_metal_init();
         if (!model.backend) {
             fprintf(stderr, "%s: ggml_backend_metal_init() failed\n", __func__);
@@ -310,13 +309,6 @@ std::vector<float> compute_graph(const test_model & model, ggml_gallocr_t allocr
         ggml_backend_cpu_set_n_threads(model.backend, n_threads);
     }
 
-#ifdef GGML_USE_METAL
-    if (ggml_backend_is_metal(model.backend)) {
-        ggml_backend_metal_set_n_cb(model.backend, n_threads);
-    }
-#endif
-
-
     ggml_backend_graph_compute(model.backend, gf);
 
     ggml_backend_synchronize(model.backend);