Small fix in breadth-first thinning.

	* mln/topo/skeleton/breadth_first_thinning.hh: Do not try to
	detach an aldready processed site.

milena/ChangeLog

+2010-09-15  Roland Levillain  <roland@lrde.epita.fr>
+
+	Small fix in breadth-first thinning.
+
+	* mln/topo/skeleton/breadth_first_thinning.hh: Do not try to
+	detach an aldready processed site.
+
 2010-09-09  Roland Levillain  <roland@lrde.epita.fr>
 	Make the 5th argument of breadth_first_thinning truly optional.

milena/mln/topo/skeleton/breadth_first_thinning.hh

@@ -148,7 +148,7 @@ namespace mln
 		 internal state and make side effects, meaning that
 		 e.g. constraint(p) might not be constant for a
 		 given p during the thinning.  */
-	      if (constraint(p) && is_simple(p))
+	      if (output(p) && constraint(p) && is_simple(p))
 		{
 		  detach(p, output);
 		  mln_niter(N) n_(nbh, p);