Info: simplify if statement

src/Info.cc

@@ -371,9 +371,8 @@ info(Field &field, int indg, int indf, int tsID, int recID, int levelID, CdiDate
       set_text_color(stdout, BLUE);
     }
 
-  size_t numNANs = 0;
-  if (not std::isnan(field.missval) and field.numMissVals == 0) { numNANs = field_num_NANs(field); }
-  if (numNANs)
+  size_t numNANs = std::isnan(field.missval) ? 0 : field_num_NANs(field);
+  if (numNANs && field.numMissVals == 0)
     {
       field.missval = cdo::NaN();
       infoStat.numMissVals += numNANs;