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This is mostly just cosmetic, since the index bias will be ignored. (The multi draw function already initializes this to 0 too.) Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com> Reviewed-by: Dave Airlie <airlied@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18126>