metisDecomp: Corrected return from metisDecomp::decompose

Resolves bug-report http://bugs.openfoam.org/view.php?id=2370

src/parallel/decompose/metisDecomp/metisDecomp.C

@@ -291,7 +291,7 @@ Foam::labelList Foam::metisDecomp::decompose
         fineDistribution[i] = finalDecomp[agglom[i]];
     }
 
-    return finalDecomp;
+    return fineDistribution;
 }