[libxml2] Revert "Fix memory leak in xmlParseBalancedChunkMemoryRecover"

[Nick Wellnhofer <nwellnhof src gnome org>]

commit a0a8059b2cadaf6bb65469ead748873c61a17ace
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sat May 30 15:33:03 2020 +0200

    Revert "Fix memory leak in xmlParseBalancedChunkMemoryRecover"
    
    This reverts commit 5a02583c7e683896d84878bd90641d8d9b0d0549.
    
    Fixes #161.

 parser.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/parser.c b/parser.c
index 4ea8e84b..4cc58b11 100644
--- a/parser.c
+++ b/parser.c
@@ -13785,8 +13785,7 @@ xmlParseBalancedChunkMemoryRecover(xmlDocPtr doc, xmlSAXHandlerPtr sax,
     xmlFreeParserCtxt(ctxt);
     newDoc->intSubset = NULL;
     newDoc->extSubset = NULL;
-    if(doc != NULL)
-       newDoc->oldNs = NULL;
+    newDoc->oldNs = NULL;
     xmlFreeDoc(newDoc);
 
     return(ret);