output min/max T as scalar

applications/solvers/heatTransfer/chtMultiRegionFoam/fluid/hEqn.H

@@ -12,6 +12,6 @@
 
     thermo.correct();
 
-    Info<< "Min/max T:" << min(thermo.T()) << ' ' << max(thermo.T())
-        << endl;
+    Info<< "Min/max T:" << min(thermo.T()).value() << ' '
+        << max(thermo.T()).value() << endl;
 }