BUG: incorrect return values for interpolated sampled meshedSurface (#1956)

- only slipped in recently, as part of !394

src/sampling/sampledSurface/sampledMeshedSurface/sampledMeshedSurfaceTemplates.C

@@ -141,6 +141,8 @@ Foam::sampledMeshedSurface::sampleOnPoints
                 );
             }
         }
+
+        return tvalues;
     }