Replace NULL with nullptr in C++ files.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=192365747

1 files changed, 2 insertions, 2 deletions

diff --git a/db/skiplist_test.cc b/db/skiplist_test.cc
index 90f9d0e..24e0887 100644
--- a/db/skiplist_test.cc
+++ b/db/skiplist_test.cc
@@ -310,7 +310,7 @@ class TestState {
 
   explicit TestState(int s)
       : seed_(s),
-        quit_flag_(NULL),
+        quit_flag_(nullptr),
         state_(STARTING),
         state_cv_(&mu_) {}
 
@@ -362,7 +362,7 @@ static void RunConcurrent(int run) {
     for (int i = 0; i < kSize; i++) {
       state.t_.WriteStep(&rnd);
     }
-    state.quit_flag_.Release_Store(&state);  // Any non-NULL arg will do
+    state.quit_flag_.Release_Store(&state);  // Any non-null arg will do
     state.Wait(TestState::DONE);
   }
 }