intel/fs: Fix use of undefined value in fixup_nomask_control_flow

Fixes: a8ac0bd759cbf "intel/fs/gen12: Workaround unwanted SEND execution..."
Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7536>
(cherry picked from commit e9caba6ce54d35870ef2fc555d00e2ccb45e40c0)
2 files changed