92ff89f6f5
This variable is only ever written as NULL, so we can omit it entirely.
Fixes: 4000c0112a ("Remove the ATI_envmap_bumpmap extension")
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6473>