[libxml2] Increase buffer space for port in HTTP redirect support

[Daniel Veillard <veillard src gnome org>]

commit 5dca9eea1bd4263bfa4d037ab2443de1cd730f7e
Author: Daniel Veillard <veillard redhat com>
Date:   Fri Apr 7 17:13:28 2017 +0200

    Increase buffer space for port in HTTP redirect support
    
    For https://bugzilla.gnome.org/show_bug.cgi?id=780690
    
    nanohttp.c: the code wrongly assumed a short int port value.

 nanohttp.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/nanohttp.c b/nanohttp.c
index e109ad7..373425d 100644
--- a/nanohttp.c
+++ b/nanohttp.c
@@ -1423,9 +1423,9 @@ retry:
     if (ctxt->port != 80) {
        /* reserve space for ':xxxxx', incl. potential proxy */
        if (proxy)
-           blen += 12;
+           blen += 17;
        else
-           blen += 6;
+           blen += 11;
     }
     bp = (char*)xmlMallocAtomic(blen);
     if ( bp == NULL ) {