fixed a potential buffer overrun error introduced on last commit to

* HTMLparser.c: fixed a potential buffer overrun error introduced
  on last commit to htmlParseScript() c.f. #310229
Daniel
diff --git a/HTMLparser.c b/HTMLparser.c
index d724620..a54fc8d 100644
--- a/HTMLparser.c
+++ b/HTMLparser.c
@@ -2627,7 +2627,7 @@
  */
 static void
 htmlParseScript(htmlParserCtxtPtr ctxt) {
-    xmlChar buf[HTML_PARSER_BIG_BUFFER_SIZE + 1];
+    xmlChar buf[HTML_PARSER_BIG_BUFFER_SIZE + 5];
     int nbchar = 0;
     int cur,l;