This condition accidentally got inverted when cleaning up code, whoops.
Fixes: 3251f321b8 ("mesa: some cleanups for texparam extension checks")
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34248>