KVM: s390: Return failure in case of failure in kvm_s390_set_cmma_bits()

KVM: s390: Return failure in case of failure in kvm_s390_set_cmma_bits()

If the allocation of the bits array failed, kvm_s390_set_cmma_bits()
would return 0 instead of an error code.

Rework the function to use the __free() macros and thus simplify the
code flow; when the above mentioned allocation fails, simply return
-ENOMEM.

Fixes: e38c884df921 ("KVM: s390: Switch to new gmap")
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260623153331.233784-10-imbrenda@linux.ibm.com>