Fix build break.

Change-Id: I0f2e70b91528a8a7567ecf5ca71315962786d937

internal/ceres/solver_impl.cc

diff --git a/internal/ceres/solver_impl.cc b/internal/ceres/solver_impl.cc
index 493a890..8e72537 100644
--- a/internal/ceres/solver_impl.cc
+++ b/internal/ceres/solver_impl.cc
@@ -329,7 +329,7 @@
 
   scoped_array<double> residual_block_evaluate_scratch;
   if (fixed_cost != NULL) {
-    residual_block_evalute_scratch.reset(
+    residual_block_evaluate_scratch.reset(
         new double[program->MaxScratchDoublesNeededForEvaluate()]);
     *fixed_cost = 0.0;
   }