af346cd77f
Currently `util_idalloc_foreach()` isn't being used in the codebase
but if used it causes a build error as `num_used` doesn't exist.
Fix that by using `num_set_elements`.
Fixes: 0589dfe4e2 ("util/idalloc: optimize foreach by tracking the greatest non-zero element")
Signed-off-by: Karmjit Mahil <karmjit.mahil@igalia.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32546>