Commit f17ec444
exec: Change cpu_memory_rw_debug() argument to CPUState

missed to update s390x KVM code, breaking the build.

Let's fix it up.
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: NAndreas Färber <afaerber@suse.de>