Get rid of NULLs in xfa/fxbarcode/

xfa/fxbarcode/oned/BC_OnedCode128Writer.cpp

Index: xfa/fxbarcode/oned/BC_OnedCode128Writer.cpp
diff --git a/xfa/fxbarcode/oned/BC_OnedCode128Writer.cpp b/xfa/fxbarcode/oned/BC_OnedCode128Writer.cpp
index bc9b14f04e2e989da67c3e384d615be25522f814..d5754230b54452cb4b8e012a581199104fc99f02 100644
--- a/xfa/fxbarcode/oned/BC_OnedCode128Writer.cpp
+++ b/xfa/fxbarcode/oned/BC_OnedCode128Writer.cpp
@@ -107,11 +107,11 @@ uint8_t* CBC_OnedCode128Writer::Encode(const CFX_ByteString& contents,
                                        int32_t& e) {
   if (format != BCFORMAT_CODE_128) {
     e = BCExceptionOnlyEncodeCODE_128;
-    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_OnedCode128Writer::Encode(const CFX_ByteString& contents,
@@ -120,7 +120,7 @@ uint8_t* CBC_OnedCode128Writer::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;
 }
 FX_BOOL CBC_OnedCode128Writer::IsDigits(const CFX_ByteString& contents,