user32: Fix to succeed reliably in test where it works by accident.

[Robert Shearman]

Jan Zerebecki wrote:
> +    if (!iconinfo->hbmMask) {
> +        return 0;
> +    }
>      if (iconinfo->hbmColor)
>      {
>   

Please match the coding style of the rest of the function.

-- 
Rob Shearman