QUIC - Make |visitor_| nullptr check consistent with other nullptr

net/quic/quic_connection.cc

Index: net/quic/quic_connection.cc
diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc
index a7aca6f1cef913eb953a87c8dd1af21a665d0541..d5cdded5c478f3c6942b948c05c2832cdc706dec 100644
--- a/net/quic/quic_connection.cc
+++ b/net/quic/quic_connection.cc
@@ -2077,7 +2077,7 @@ void QuicConnection::CloseConnection(QuicErrorCode error, bool from_peer) {
   // TODO(rtenneti): crbug.com/546668. A temporary fix. Added a check for null
   // |visitor_| to fix crash bug. Delete |visitor_| check and histogram after
   // fix is merged.
-  if (visitor_) {
+  if (visitor_ != nullptr) {
     visitor_->OnConnectionClosed(error, from_peer);
   } else {
     UMA_HISTOGRAM_BOOLEAN("Net.QuicCloseConnection.NullVisitor", true);