Fix buffer overflow in evutil.

Upstream bug report:

https://github.com/libevent/libevent/issues/318

Patch copied from upstream source repository:

https://github.com/libevent/libevent/commit/329acc18a0768c21ba22522f01a5c7f46cacc4d5

From 28bdc2f3f62259d21ccaf7be2b60ef0a53e6f342 Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <a3at.mail@gmail.com>
Date: Sun, 31 Jan 2016 00:57:16 +0300
Subject: [PATCH] evutil_parse_sockaddr_port(): fix buffer overflow

---
 evutil.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/evutil.c b/evutil.c
index 33445170..e2dfe6e4 100644
--- a/evutil.c
+++ b/evutil.c
@@ -1808,12 +1808,12 @@ evutil_parse_sockaddr_port(const char *ip_as_string, struct sockaddr *out, int *
 
 	cp = strchr(ip_as_string, ':');
 	if (*ip_as_string == '[') {
-		int len;
+		size_t len;
 		if (!(cp = strchr(ip_as_string, ']'))) {
 			return -1;
 		}
-		len = (int) ( cp-(ip_as_string + 1) );
-		if (len > (int)sizeof(buf)-1) {
+		len = ( cp-(ip_as_string + 1) );
+		if (len > sizeof(buf)-1) {
 			return -1;
 		}
 		memcpy(buf, ip_as_string+1, len);
-- 
2.11.0

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<div class='path'>path: <a href='/guix/log/?id=ad9fd1ba2c2125f0d7b8b69f7ab0df65d30e038f'>root</a>/<a href='/guix/log/gnu?id=ad9fd1ba2c2125f0d7b8b69f7ab0df65d30e038f'>gnu</a>/<a href='/guix/log/gnu/packages?id=ad9fd1ba2c2125f0d7b8b69f7ab0df65d30e038f'>packages</a>/<a href='/guix/log/gnu/packages/accessibility.scm?id=ad9fd1ba2c2125f0d7b8b69f7ab0df65d30e038f'>accessibility.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/accessibility.scm?id=ad9fd1ba2c2125f0d7b8b69f7ab0df65d30e038f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-03-18 15:05:08 +0100'>2019-03-18</span></td><td><a href='/guix/commit/gnu/packages/accessibility.scm?id=47956fa0c24efcdcba3493f0231c30e9a39ec7df'>Correct name and email address for ng0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .mailmap, Makefile.am, doc/guix.de.texi, doc/guix.fr.texi,
doc/guix.texi, etc/completion/fish/guix.fish,
gnu/packages/accessibility.scm, gnu/packages/admin.scm,
gnu/packages/audio.scm, gnu/packages/autotools.scm,
gnu/packages/cdrom.scm, gnu/packages/check.scm,
gnu/packages/cinnamon.scm, gnu/packages/compression.scm,
gnu/packages/crypto.scm, gnu/packages/databases.scm,
gnu/packages/django.scm, gnu/packages/dns.scm, gnu/packages/elixir.scm,
gnu/packages/emacs-xyz.scm, gnu/packages/emacs.scm,
gnu/packages/enlightenment.scm, gnu/packages/erlang.scm,
gnu/packages/fonts.scm, gnu/packages/fontutils.scm,
gnu/packages/forth.scm, gnu/packages/fvwm.scm, gnu/packages/games.scm,
gnu/packages/gl.scm, gnu/packages/gnome.scm, gnu/packages/gnunet.scm,
gnu/packages/gnupg.scm, gnu/packages/gnuzilla.scm, gnu/packages/gtk.scm,
gnu/packages/guile-wm.scm,gnu/packages/guile-xyz.scm,
gnu/packages/haskell-check.scm, gnu/packages/haskell-crypto.scm,
gnu/packages/haskell.scm, gnu/packages/image-viewers.scm,
gnu/packages/image.scm, gnu/packages/irc.scm,
gnu/packages/language.scm, gnu/packages/libcanberra.scm,
gnu/packages/linux.scm, gnu/packages/lisp.scm, gnu/packages/lolcode.scm,
gnu/packages/lxde.scm, gnu/packages/lxqt.scm, gnu/packages/mail.scm,
gnu/packages/markup.scm, gnu/packages/mate.scm, gnu/packages/maths.scm,
gnu/packages/mc.scm, gnu/packages/messaging.scm, gnu/packages/music.scm,
gnu/packages/ncurses.scm, gnu/packages/networking.scm,
gnu/packages/nickle.scm, gnu/packages/openbox.scm, gnu/packages/pdf.scm,
gnu/packages/perl-check.scm, gnu/packages/perl.scm,
gnu/packages/python-compression.scm, gnu/packages/python-crypto.scm,
gnu/packages/python-web.scm, gnu/packages/python-xyz.scm,
gnu/packages/python.scm, gnu/packages/qt.scm, gnu/packages/ruby.scm,
gnu/packages/rust.scm, gnu/packages/scheme.scm,
gnu/packages/serialization.scm, gnu/packages/shells.scm,
gnu/packages/ssh.scm, gnu/packages/suckless.scm, gnu/packages/tbb.scm,
gnu/packages/telephony.scm, gnu/packages/text-editors.scm,
gnu/packages/textutils.scm, gnu/packages/time.scm, gnu/packages/tls.scm,
gnu/packages/tor.scm, gnu/packages/version-control.scm,
gnu/packages/video.scm, gnu/packages/vim.scm, gnu/packages/web.scm,
gnu/packages/wm.scm, gnu/packages/xdisorg.scm, gnu/packages/xfce.scm,
gnu/packages/xml.scm, gnu/packages/xorg.scm, gnu/services/certbot.scm,
gnu/services/desktop.scm, gnu/services/version-control.scm,
gnu/services/web.scm, guix/import/hackage.scm, guix/licenses.scm:
Correct name and email address for ng0.

Signed-off-by: Tobias Geerinckx-Rice &lt;me@tobias.gr&gt;
</span></span></td><td>ng0</td></tr>
<tr><td><span title='2019-02-08 23:50:53 +0100'>2019-02-08</span></td><td><a href='/guix/commit/gnu/packages/accessibility.scm?id=1f6a970592d03b3600b483ad48e34568ae1f4e9a'>gnu: florence: Don't use NAME in source URI.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/accessibility.scm (florence)[source]: Hard-code name.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>