COMP: noThermo: compilation issue under clang

src/regionModels/thermalBaffleModels/noThermo/noThermo.C

@@ -151,7 +151,7 @@ const solidThermo& noThermo::thermo() const
     FatalErrorIn("const volScalarField& noThermo::T() const")
         << "T field not available for " << type()
         << abort(FatalError);
-    return reinterpret_cast<const solidThermo&>(null);
+    return *reinterpret_cast<const solidThermo*>(NULL);
 }