s390/etr,stp: use -EOPNOTSUPP instead of -ENOSYS
Change -ENOSYS to -EOPNOTSUPP. Return value is used only internally. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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