src: replace NULL with nullptr

Now that we are building with C++11 features enabled, replace use
of NULL with nullptr.

The benefit of using nullptr is that it can never be confused for
an integral type because it does not support implicit conversions
to integral types except boolean - unlike NULL, which is defined
as a literal `0`.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/node_wrap.h b/src/node_wrap.h
index 8762ec40c7..5403f711fe 100644
--- a/src/node_wrap.h
+++ b/src/node_wrap.h
@@ -60,7 +60,7 @@ inline uv_stream_t* HandleToStream(Environment* env,
     return reinterpret_cast<uv_stream_t*>(wrap->UVHandle());
   });
 
-  return NULL;
+  return nullptr;
 }
 
 }  // namespace node