s390x/ipl: we always have an ipl device
Both s390 machines unconditionally create an ipl device, so no need to handle the missing case. Now we can also change s390_ipl_update_diag308() to return void. Reviewed-by: NCornelia Huck <cornelia.huck@de.ibm.com> Acked-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NDavid Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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