libfuzzer: FALSE is not a pointer

testing/libfuzzer/pdf_xml_fuzzer.cc

Index: testing/libfuzzer/pdf_xml_fuzzer.cc
diff --git a/testing/libfuzzer/pdf_xml_fuzzer.cc b/testing/libfuzzer/pdf_xml_fuzzer.cc
index 199cba29966b6916f862092748f9066376ce67a8..37b4a760df4b464a5918faba9bbecdaa5c79a71e 100644
--- a/testing/libfuzzer/pdf_xml_fuzzer.cc
+++ b/testing/libfuzzer/pdf_xml_fuzzer.cc
@@ -32,7 +32,7 @@ CFDE_XMLNode* XFA_FDEExtension_GetDocumentNode(
              pNextNode;
              pNextNode = pNextNode->GetNodeItem(CFDE_XMLNode::NextSibling)) {
           if (pNextNode->GetType() == FDE_XMLNODE_Element) {
-            return FALSE;
+            return nullptr;
           }
         }
       }