VDMOS: concatenate inner node name

src/spicelib/devices/vdmos/vdmosset.c

@@ -377,7 +377,7 @@ VDMOSsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt,
 
             if (model->VDIOresistance > 0 ) {
                 if (here->VDIOposPrimeNode == 0) {
-                    error = CKTmkVolt(ckt, &tmp, here->VDMOSname, "body diode");
+                    error = CKTmkVolt(ckt, &tmp, here->VDMOSname, "body_diode");
                     if (error) return(error);
                     here->VDIOposPrimeNode = tmp->number;