vbic: selfheating switch selft has priority, but keep compatibility

src/spicelib/devices/vbic/vbicsetup.c

@@ -487,11 +487,16 @@ VBICsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt, int *states)
                 }
             }
 
-            if((model->VBICthermalResistGiven) && (model->VBICthermalResist > 0.0)
-                    && model->VBICselftGiven && model->VBICselft == 1)
-                here->VBIC_selfheat = 1;
+            if(model->VBICselftGiven)
+                if(model->VBICselft == 1)
+                    here->VBIC_selfheat = 1;
+                else
+                    here->VBIC_selfheat = 0;
             else
-                here->VBIC_selfheat = 0;
+                if((model->VBICthermalResistGiven) && (model->VBICthermalResist > 0.0))
+                    here->VBIC_selfheat = 1;
+                else
+                    here->VBIC_selfheat = 0;
 
             if((model->VBICthermalResistGiven) && (model->VBICthermalCapacitance < 1e-12))
                 model->VBICthermalCapacitance = 1e-12;