[libxml2] Correct variable type to unsigned

[Daniel Veillard <veillard src gnome org>]

commit 730468333533f183c95bf4dbb3976a2c1dfe2fba
Author: Nikolay Sivov <bunglehead gmail com>
Date:   Tue Jan 19 15:38:05 2010 +0100

    Correct variable type to unsigned
    
    * parser.c: fix len sign in xmlParseChunk()

 parser.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/parser.c b/parser.c
index b41dcc3..c779c1d 100644
--- a/parser.c
+++ b/parser.c
@@ -11546,7 +11546,7 @@ xmldecl_done:
          */
         if ((ctxt->instate == XML_PARSER_START) && (ctxt->input != NULL) &&
             (ctxt->input->buf != NULL) && (ctxt->input->buf->encoder != NULL)) {
-            int len = 45;
+            unsigned int len = 45;
 
             if ((xmlStrcasestr(BAD_CAST ctxt->input->buf->encoder->name,
                                BAD_CAST "UTF-16")) ||