Bugfix in method dbgs

Patch by Matthias Wohlmuth

FS 1170

[[Imported from SVN: r1685]]

COPYING

@@ -21,7 +21,7 @@ Copyright holders:
 2004--2012    Oliver Sander
 2008--2012    Uli Sack
 2006--2010    Martin Weiser
-2011          Matthias Wohlmuth
+2011--2012    Matthias Wohlmuth
 
 
 The DUNE library and headers are licensed under version 2 of the GNU

dune/istl/gsetc.hh

@@ -412,7 +412,7 @@ namespace Dune {
         coliterator j=(*i).begin();
         for (; j.index()<i.index(); ++j)
           (*j).mmv(x[j.index()],rhs);
-        coliterator diag=j;
+        coliterator diag=j++;
         for (; j != endj; ++j)
           (*j).mmv(x[j.index()],rhs);
         algmeta_itsteps<I-1>::dbgs(*diag,x[i.index()],rhs,w);