Enable clang-tidy as a sanity check, fix up all known failures
diff --git a/test/core/channel/channel_stack_builder_test.cc b/test/core/channel/channel_stack_builder_test.cc
index 1571f6e..a67f0ef 100644
--- a/test/core/channel/channel_stack_builder_test.cc
+++ b/test/core/channel/channel_stack_builder_test.cc
@@ -71,8 +71,8 @@
static void test_channel_stack_builder_filter_replace(void) {
grpc_channel* channel =
- grpc_insecure_channel_create("target name isn't used", NULL, NULL);
- GPR_ASSERT(channel != NULL);
+ grpc_insecure_channel_create("target name isn't used", nullptr, nullptr);
+ GPR_ASSERT(channel != nullptr);
// Make sure the high priority filter has been created.
GPR_ASSERT(g_replacement_fn_called);
// ... and that the low priority one hasn't.