Fix an uninitialized variable use

When compiled without SAX1 support
diff --git a/parser.c b/parser.c
index b39aa59..1b80a8c 100644
--- a/parser.c
+++ b/parser.c
@@ -9565,7 +9565,7 @@
     const xmlChar *prefix = NULL;
     const xmlChar *URI = NULL;
     xmlParserNodeInfo node_info;
-    int line, tlen;
+    int line, tlen = 0;
     xmlNodePtr ret;
     int nsNr = ctxt->nsNr;