gallium: Fix leak of bound SSBOs at CSO context destruction.

Cc: mesa-stable
Reviewed-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7695>
(cherry picked from commit 634384e4a09d897e0f045e6e99b787804ef4fe40)
2 files changed