Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/common/BC_CommonCharacterSetECI.cpp

Index: xfa/fxbarcode/common/BC_CommonCharacterSetECI.cpp
diff --git a/xfa/fxbarcode/common/BC_CommonCharacterSetECI.cpp b/xfa/fxbarcode/common/BC_CommonCharacterSetECI.cpp
index d6fa9e472efdf1448f27e2f98342f32c37802922..ebc5593bf221b50c5c6999ea2072bc213e473fae 100644
--- a/xfa/fxbarcode/common/BC_CommonCharacterSetECI.cpp
+++ b/xfa/fxbarcode/common/BC_CommonCharacterSetECI.cpp
@@ -36,9 +36,9 @@ void CBC_CommonCharacterSetECI::AddCharacterSet(int32_t value,
                                                 CFX_ByteString encodingName) {}
 CBC_CommonCharacterSetECI* CBC_CommonCharacterSetECI::GetCharacterSetECIByValue(
     int32_t value) {
-  return NULL;
+  return nullptr;
 }
 CBC_CommonCharacterSetECI* CBC_CommonCharacterSetECI::GetCharacterSetECIByName(
     const CFX_ByteString& name) {
-  return NULL;
+  return nullptr;
 }