KVM: PPC: Memset vcpu to zeros

While converting the kzalloc we used to allocate our vcpu struct to
vmalloc, I forgot to memset the contents to zeros. That broke quite
a lot.

This patch memsets it to zero again.
Signed-off-by: Alexander Graf <alex@csgraf.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/powerpc/kvm/book3s.c

@@ -1117,6 +1117,7 @@ struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
 		err = -ENOMEM;
 		goto out;
 	}
+	memset(vcpu_book3s, 0, sizeof(struct kvmppc_vcpu_book3s));
 
 	vcpu = &vcpu_book3s->vcpu;
 	err = kvm_vcpu_init(vcpu, kvm, id);