KVM: s390: Fix leaking kvm_s390_mmu_cache in case of errors

Fix a memory leak that can happen if gmap_ucas_map_one() or
kvm_s390_mmu_cache_topup() return error values.

Also fix a similar issue in gmap_set_limit().

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Fixes: a2c17f9270cc ("KVM: s390: New gmap code")
Reported-by: Jiaxin Fan <jiaxin.fan@ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>