radv: Fix leak in radv_amdgpu_winsys_destroy()

Fixes: fa97061a823 ("radv/winsys: Add binary syncobj ABI changes for timeline semaphores.")

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7866>
(cherry picked from commit 6ec0953e22cfea4e4869e45b784a13f44b65c275)
2 files changed