llvm-mt: Fix release of OutputDoc

Summary:
xmlDoc needs to be released with xmlFreeDoc.
Reset root element before release to avoid release of CombinedRoot owned
by CombinedDoc,

Reviewers: ecbeckmann, rnk, zturner, ruiu

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D37321

llvm-svn: 312207

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/WindowsManifest/WindowsManifestMerger.cpp b/llvm/lib/WindowsManifest/WindowsManifestMerger.cpp
index 91547c98469..da968c4ae1a 100644
--- a/llvm/lib/WindowsManifest/WindowsManifestMerger.cpp
+++ b/llvm/lib/WindowsManifest/WindowsManifestMerger.cpp
@@ -652,11 +652,13 @@ WindowsManifestMerger::WindowsManifestMergerImpl::getMergedManifest() {
     xmlNodePtr CombinedRoot = xmlDocGetRootElement(CombinedDoc);
     std::vector<xmlNsPtr> RequiredPrefixes;
     checkAndStripPrefixes(CombinedRoot, RequiredPrefixes);
-    std::unique_ptr<xmlDoc> OutputDoc(xmlNewDoc((const unsigned char *)"1.0"));
+    std::unique_ptr<xmlDoc, decltype(&xmlFreeDoc)> OutputDoc(
+        xmlNewDoc((const unsigned char *)"1.0"), &xmlFreeDoc);
     xmlDocSetRootElement(OutputDoc.get(), CombinedRoot);
     xmlKeepBlanksDefault(0);
     xmlDocDumpFormatMemoryEnc(OutputDoc.get(), &XmlBuff, &BufferSize, "UTF-8",
                               1);
+    xmlDocSetRootElement(OutputDoc.get(), nullptr);
   }
   if (BufferSize == 0)
     return nullptr;