Style Change: NULL->nullptr

src/images/bmpdecoderhelper.h

Index: src/images/bmpdecoderhelper.h
diff --git a/src/images/bmpdecoderhelper.h b/src/images/bmpdecoderhelper.h
index a0116de83374af8f090ebb32377ed2188dab0770..b448734bbc6aa1ad935ddca6aeb7da4f1016ff52 100644
--- a/src/images/bmpdecoderhelper.h
+++ b/src/images/bmpdecoderhelper.h
@@ -57,7 +57,7 @@ class BmpDecoderCallback {
   /**
    * This is called once for an image. It is passed the width and height and
    * should return the address of a buffer that is large enough to store
-   * all of the resulting pixels (widht * height * 3 bytes). If it returns NULL,
+   * all of the resulting pixels (widht * height * 3 bytes). If it returns nullptr,
    * then the decoder will abort, but return true, as the caller has received
    * valid dimensions.
    */