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commit a2b257d6212a "memory: expose alignment used for allocating RAM as MemoryRegion API" triggered a compile error on KVM/s390x. Fix the prototype and the implementation of legacy_s390_alloc. Cc: Igor Mammedov <imammedo@redhat.com> Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>