By using IS_ENABLED() we can simplify __set_pte_at() by removing
redundant *ptep = pte.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>