Style Change: NULL->nullptr

src/images/bmpdecoderhelper.cpp

Index: src/images/bmpdecoderhelper.cpp
diff --git a/src/images/bmpdecoderhelper.cpp b/src/images/bmpdecoderhelper.cpp
index 5a1b39ac90d3b36e96e5736917ddd88630da11ce..9171b5d5278410592db36c7e82d7170d9b90ca02 100644
--- a/src/images/bmpdecoderhelper.cpp
+++ b/src/images/bmpdecoderhelper.cpp
@@ -163,7 +163,7 @@ bool BmpDecoderHelper::DecodeImage(const char* p,
   }
 
   output_ = callback->SetSize(width_, height_);
-  if (NULL == output_) {
+  if (nullptr == output_) {
     return true;  // meaning we succeeded, but they want us to stop now
   }