x86/HVM: restore parentheses lost by 3d4d4f9336

("x86: consolidate boolean inputs in hvm and p2m into a shared bitmap")

Coverity-ID: 1234366

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -2796,7 +2796,7 @@ int hvm_hap_nested_page_fault(paddr_t gp
 
     p2m = p2m_get_hostp2m(v->domain);
     mfn = get_gfn_type_access(p2m, gfn, &p2mt, &p2ma, 
-                              P2M_ALLOC | npfec.write_access ? P2M_UNSHARE : 0,
+                              P2M_ALLOC | (npfec.write_access ? P2M_UNSHARE : 0),
                               NULL);
 
     /* Check access permissions first, then handle faults */