Isolate nullptr to grpc namespace when we must define it ourselves

Change the one non-namespace use of nullptr to NULL (used as an
argument to a C function anyway)

1 files changed, 1 insertions, 1 deletions

diff --git a/test/cpp/qps/timer.cc b/test/cpp/qps/timer.cc
index 07289f699b..c1ba23decd 100644
--- a/test/cpp/qps/timer.cc
+++ b/test/cpp/qps/timer.cc
@@ -52,7 +52,7 @@ static double time_double(struct timeval* tv) {
 Timer::Result Timer::Sample() {
   struct rusage usage;
   struct timeval tv;
-  gettimeofday(&tv, nullptr);
+  gettimeofday(&tv, NULL);
   getrusage(RUSAGE_SELF, &usage);
 
   Result r;