Load bones, bone indices and weights into model

model.c

@@ -16,9 +16,19 @@ model_t model_init(size_t vertex_count, size_t index_count)
 
 void model_cleanup(model_t *m)
 {
-	free(m->vertices);
-	free(m->indices);
-	m->vertices = nullptr;
-	m->indices = nullptr;
-	m->vertex_count = m->index_count = 0;
+	if (m->vertices != nullptr) {
+		free(m->vertices);
+		m->vertices = nullptr;
+		m->vertex_count = 0;
+	}
+	if (m->indices != nullptr) {
+		free(m->indices);
+		m->indices = nullptr;
+		m->index_count = 0;
+	}
+	if (m->bones != nullptr) {
+		free(m->bones);
+		m->bones = nullptr;
+		m->bone_count = 0;
+	}
 }