KVM: powerpc: kvmppc_visible_gpa can be boolean

In another patch kvm_is_visible_gfn is maken return bool due to this
function only returns zero or one as its return value, let's also make
kvmppc_visible_gpa return bool to keep consistent.

No functional change.
Signed-off-by: NYaowei Bai <baiyaowei@cmss.chinamobile.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

arch/powerpc/kvm/book3s_pr.c

@@ -512,7 +512,7 @@ static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 	put_page(hpage);
 }
 
-static int kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
+static bool kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
 {
 	ulong mp_pa = vcpu->arch.magic_page_pa;
 
@@ -521,7 +521,7 @@ static int kvmppc_visible_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
 
 	gpa &= ~0xFFFULL;
 	if (unlikely(mp_pa) && unlikely((mp_pa & KVM_PAM) == (gpa & KVM_PAM))) {
-		return 1;
+		return true;
 	}
 
 	return kvm_is_visible_gfn(vcpu->kvm, gpa >> PAGE_SHIFT);