[libxml2] Fix reuse of xmlInitParser

[Daniel Veillard <veillard src gnome org>]

commit 7a2215dbcd4882e45f618c5f78f8d975b7c47ed3
Author: Daniel Veillard <veillard redhat com>
Date:   Tue Sep 4 12:05:17 2012 +0800

    Fix reuse of xmlInitParser
    
    While xmlCleanupParser() should not be used unless complete control
    is insured over the programe making sure libxml2 is not in use anywhere
    It should still be usable, and allow a sequence of
        xmlInitParser();
        xmlCleanupParser();
    calls if needed, the problem is that the thread key wasn't reallocated
    on subsequent xmlinitParser() calls leading to corruption of pthread
    keys used by the program.
    
    * threads.c: make sure xmlCleanupParser() reset the pthread_once()
                 global variable driving thread key allocation.

 threads.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/threads.c b/threads.c
index 6d25565..f206149 100644
--- a/threads.c
+++ b/threads.c
@@ -915,6 +915,7 @@ xmlCleanupThreads(void)
 #ifdef HAVE_PTHREAD_H
     if ((libxml_is_threaded)  && (pthread_key_delete != NULL))
         pthread_key_delete(globalkey);
+    once_control = PTHREAD_ONCE_INIT;
 #elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
     if (globalkey != TLS_OUT_OF_INDEXES) {
         xmlGlobalStateCleanupHelperParams *p;