Fix a logic error in iterative_refiner_test

Change-Id: I741802db37d6d9e42e38cef358e00369f6a38d06

internal/ceres/iterative_refiner_test.cc

diff --git a/internal/ceres/iterative_refiner_test.cc b/internal/ceres/iterative_refiner_test.cc
index 0b09247..9ea2340 100644
--- a/internal/ceres/iterative_refiner_test.cc
+++ b/internal/ceres/iterative_refiner_test.cc
@@ -99,7 +99,7 @@
     VectorRef solution(solution_ptr, num_cols);
     ConstVectorRef rhs(rhs_ptr, num_cols);
     auto llt = lhs_.llt();
-    CHECK_NE(llt.info(), Eigen::Success);
+    CHECK_EQ(llt.info(), Eigen::Success);
     solution = llt.solve(rhs.cast<Scalar>()).template cast<double>();
     return LinearSolverTerminationType::SUCCESS;
   }