Get DataType from internal format if there's no hint
Get DataType from internal format if there's no hint

* dataType would never have been eGL_NONE previously, since it's either set to
  the hint or eGL_UNSIGNED_BYTE.

baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,baldurk/renderdoc,TurtleRockStudios/renderdoc_public,googlestadia/renderdoc,googlestadia/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,googlestadia/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc