patch from Rachel Hestilow to fix bug #84340

* xmlIO.c: patch from Rachel Hestilow to fix bug #84340
diff --git a/xmlIO.c b/xmlIO.c
index 7c5706e..949d9c6 100644
--- a/xmlIO.c
+++ b/xmlIO.c
@@ -145,6 +145,7 @@
     }
 
     xmlInputCallbackNr = 0;
+    xmlInputCallbackInitialized = 0;
 }
 
 /**
@@ -169,6 +170,7 @@
     }
 
     xmlOutputCallbackNr = 0;
+    xmlOutputCallbackInitialized = 0;
 }
 
 /************************************************************************