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Update maintainer entry for s390 PCI subsystem.
Sebastian has left IBM, Niklas takes over maintainership.
Signed-off-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Acked-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>