ordering -> linear_solver_ordering.

Change-Id: If4af72da90725db2a2d4f397f4cb671c2e863a98
diff --git a/internal/ceres/solver.cc b/internal/ceres/solver.cc
index a6c804b..450a710 100644
--- a/internal/ceres/solver.cc
+++ b/internal/ceres/solver.cc
@@ -42,7 +42,7 @@
 namespace ceres {
 
 Solver::Options::~Options() {
-  delete ordering;
+  delete linear_solver_ordering;
   delete inner_iteration_ordering;
 }