message: Fix Metal bug not creating default depth attachment
diff: @@ -562,7 +562,7 @@ MetalRenderTarget::Attachment MetalRenderTarget::getDepthAttachment() {
  if (defaultRenderTarget) {
  result.texture = acquireDepthTexture(context);
  }
  - return depth;
  + return result;
  }
  MTLLoadAction MetalRenderTarget::getLoadAction(const RenderPassParams& params,
  