qemu: process: Fix off-by-one in vcpu order duplicate error message

The bitmap indexes for the order duplicate check are shifted to 0 since
vcpu order 0 is not allowed. The error message doesn't need such
treating though.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1370360

src/qemu/qemu_process.c

@@ -4807,7 +4807,7 @@ qemuProcessValidateHotpluggableVcpus(virDomainDefPtr def)
         if (vcpu->order != 0) {
             if (virBitmapIsBitSet(ordermap, vcpu->order - 1)) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                               _("duplicate vcpu order '%u'"), vcpu->order - 1);
+                               _("duplicate vcpu order '%u'"), vcpu->order);
                 goto cleanup;
             }