BUG: setFields: parallel running with different number of proc patches

applications/utilities/preProcessing/setFields/setFields.C

@@ -227,7 +227,11 @@ bool setFaceFieldType
 
         // Override
         bool hasWarned = false;
-        labelList nChanged(field.boundaryField().size(), 0);
+        labelList nChanged
+        (
+            returnReduce(field.boundaryField().size(), maxOp<label>()),
+            0
+        );
         forAll(selectedFaces, i)
         {
             label facei = selectedFaces[i];