tmpNrc: Updated to use clone

src/OpenFOAM/memory/tmp/tmpI.H

-/*--------------------------------------------------------------------r-------*\
+/*---------------------------------------------------------------------------*\
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |

src/OpenFOAM/memory/tmpNrc/tmpNrcI.H

-/*--------------------------------------------------------------------r-------*\
+/*---------------------------------------------------------------------------*\
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2016-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -175,7 +175,7 @@ inline T* Foam::tmpNrc<T>::ptr() const
     }
     else
     {
-        return new T(*ptr_);
+        return ptr_->clone().ptr();
     }
 }