Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/oned/BC_OnedCodaBarWriter.cpp

Index: xfa/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
diff --git a/xfa/fxbarcode/oned/BC_OnedCodaBarWriter.cpp b/xfa/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
index 2d9c2e5ad873011e1a944a47cbeadedff6c06102..59f4d5ea4dd557f1810f9cf67895534fff2463d6 100644
--- a/xfa/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
+++ b/xfa/fxbarcode/oned/BC_OnedCodaBarWriter.cpp
@@ -137,7 +137,7 @@ uint8_t* CBC_OnedCodaBarWriter::Encode(const CFX_ByteString& contents,
                                        int32_t& outHeight,
                                        int32_t& e) {
   uint8_t* ret = Encode(contents, format, outWidth, outHeight, 0, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return ret;
 }
 uint8_t* CBC_OnedCodaBarWriter::Encode(const CFX_ByteString& contents,
@@ -148,11 +148,11 @@ uint8_t* CBC_OnedCodaBarWriter::Encode(const CFX_ByteString& contents,
                                        int32_t& e) {
   if (format != BCFORMAT_CODABAR) {
     e = BCExceptionOnlyEncodeCODEBAR;
-    return NULL;
+    return nullptr;
   }
   uint8_t* ret =
       CBC_OneDimWriter::Encode(contents, format, outWidth, outHeight, hints, e);
-  BC_EXCEPTION_CHECK_ReturnValue(e, NULL);
+  BC_EXCEPTION_CHECK_ReturnValue(e, nullptr);
   return ret;
 }
 uint8_t* CBC_OnedCodaBarWriter::Encode(const CFX_ByteString& contents,