s390/ap: Fix typo in function name reference
Add missing s into ap_intructions_available.
Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Reviewed-by: Jimmy Brisson <jbrisson@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
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