[PATCH] glx: Add null pointer protection to __glGetProcAddress

[Eric Anholt]

Adam Jackson <ajax at redhat.com> writes:

> This can't happen when GLX is the backing window system, but can
> elsewhere.  We may as well protect against it at a high level.

(where "elsewhere" is both egl and wgl, each with different sets of
functions that will return NULL.  What a delightful API)

An ErrorF when returning NoopDDA to warn that we're papering over a bug
in implementing some function would be pretty nice.  Either way,

Reviewed-by: Eric Anholt <eric at anholt.net>

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