[PATCH 05/10] glx: glXSwapBuffers doesn't use core X error values

[Adam Jackson]

On Thu, 2013-10-31 at 15:43 -0700, Keith Packard wrote:
> Make sure we return only the defined GLX error values

SwapBuffers doesn't, but MakeCurrent does, and __glXGetDrawable is
called from both.

- ajax