KVM: s390: only reset CMMA state if it was enabled before
KVM: s390: only reset CMMA state if it was enabled before

There is no point in resetting the CMMA state if it was never enabled.

Signed-off-by: Dominik Dingel <d1e5197fc3340c52389f7f33900df40c6bf98e12@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <ae115cfa58aaa81618f054056f573d0d78c5ed09@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <49712f635b03c16d7f4c43df70e49ec8c565813d@de.ibm.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs