Don't use bitwise operators, but logic operators

src/spicelib/devices/vsrc/vsrcpar.c

@@ -298,14 +298,14 @@ VSRCparam(int param, IFvalue *value, GENinstance *inst, IFvalue *select)
         {
             here->VSRCportNum = value->iValue;
             here->VSRCportNumGiven = TRUE;
-            here->VSRCisPort = ((here->VSRCportNumGiven) & (here->VSRCportNum > 0) & (here->VSRCportZ0 > 0.0));
+            here->VSRCisPort = ((here->VSRCportNumGiven) && (here->VSRCportNum > 0) && (here->VSRCportZ0 > 0.0));
             break;
         }
         case VSRC_PORTZ0:
         {
             here->VSRCportZ0 = value->rValue;
             here->VSRCVAmplitude = sqrt(here->VSRCportPower * 4.0 * here->VSRCportZ0);
-            here->VSRCisPort = ((here->VSRCportNumGiven) & (here->VSRCportNum > 0) & (here->VSRCportZ0 > 0.0));
+            here->VSRCisPort = ((here->VSRCportNumGiven) && (here->VSRCportNum > 0) && (here->VSRCportZ0 > 0.0));
             here->VSRCportZ0Given = TRUE;
             break;
         }