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

Review URL: https://codereview.chromium.org/1316233002
diff --git a/samplecode/SampleDash.cpp b/samplecode/SampleDash.cpp
index e4fa79d..a01c079 100644
--- a/samplecode/SampleDash.cpp
+++ b/samplecode/SampleDash.cpp
@@ -73,7 +73,7 @@
             SkDashPathEffect dash(interval, len, 0);
             paint.setPathEffect(&dash);
             canvas->drawLine(x0, y0, x1, y0, paint);
-            paint.setPathEffect(NULL);
+            paint.setPathEffect(nullptr);
 
             y0 += paint.getStrokeWidth() * 3;
         }