Style Change: NULL->nullptr
DOCS_PREVIEW= https://skia.org/?cl=1316233002

Review URL: https://codereview.chromium.org/1316233002
diff --git a/tools/lua/lua_app.cpp b/tools/lua/lua_app.cpp
index f24570a..6aea8ee 100644
--- a/tools/lua/lua_app.cpp
+++ b/tools/lua/lua_app.cpp
@@ -33,7 +33,7 @@
     SkLua L;
 
     for (int i = 1; i < argc; ++i) {
-        SkData* data = NULL;
+        SkData* data = nullptr;
         const void* ptr;
         size_t len;