Remove extra intensity calculation

src/shader/shaders.c

@@ -80,7 +80,7 @@ internal FragmentResult phong_shader_fragment(void *shader, V3f normal,
                                               V2f tex_coords,
                                               const Colour *colour,
                                               const Model *model) {
-  f32 intensity = get_intensity(&normal);
+  f32 intensity;
   if (model->normal) {
     u64 nm_x = tex_coords.u * model->normal->width;
     u64 nm_y = (1.0f - tex_coords.v) * model->normal->height;