Load inverse bind matrices into model

model.c

@@ -29,6 +29,10 @@ void model_cleanup(model_t *m)
 	if (m->bones != nullptr) {
 		free(m->bones);
 		m->bones = nullptr;
-		m->bone_count = 0;
 	}
+	if (m->inverse_bind_matrices != nullptr) {
+		free(m->inverse_bind_matrices);
+		m->inverse_bind_matrices = nullptr;
+	}
+    m->vertex_count = m->index_count = m->bone_count = 0;
 }