refs #5351 correct corner case that was causing +inf, +inf point to not be covered by unit test

git-svn-id: file:///svn/toku/tokudb@50109 c7de825b-a66e-492c-adef-691d508d4ae1

locktree/tests/range_buffer_test.cc

@@ -15,7 +15,7 @@ const size_t num_points = 60;
 static const DBT *get_dbt_by_iteration(size_t i) {
     if (i == 0) {
         return toku_dbt_negative_infinity();
-    } else if (i < num_points) {
+    } else if (i < (num_points - 1)) {
         return get_dbt(i); 
     } else {
         return toku_dbt_positive_infinity();