Fix a problem with PK's strndup() implementation assuming all strings

passed to it would be NUL-terminated.  This is known to fix crashes with
polkit-gnome-authorization and clock-applet.

Tested by:	pav

sysutils/policykit/Makefile

@@ -8,7 +8,7 @@
 
 PORTNAME=	policykit
 PORTVERSION=	0.8
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	sysutils gnome
 MASTER_SITES=	http://hal.freedesktop.org/releases/
 DISTNAME=	PolicyKit-${PORTVERSION}

sysutils/policykit/files/patch-src_kit_kit-string.c

@@ -1,6 +1,6 @@
 --- src/kit/kit-string.c.orig	2008-04-08 15:44:50.000000000 -0400
-+++ src/kit/kit-string.c	2008-04-22 01:00:49.000000000 -0400
-@@ -113,6 +113,28 @@ out:
++++ src/kit/kit-string.c	2008-07-03 18:17:57.000000000 -0400
+@@ -113,6 +113,33 @@ out:
  
  #else
  
@@ -14,13 +14,18 @@
 +        if ( !s )
 +                return NULL;
 +
-+        if ( strlen(s) > n )
-+                nAvail = n + 1;
-+        else
-+                nAvail = strlen(s) + 1;
-+        p = malloc ( nAvail );
++	if (memchr(s, '\0', n) != NULL) {
++		nAvail = strlen(s);
++        	if ( nAvail > n )
++                	nAvail = n;
++	} else {
++		nAvail = n;
++	}
++        p = malloc ( nAvail + 1 );
++	if ( p == NULL)
++		return NULL;
 +        memcpy ( p, s, nAvail );
-+        p[nAvail - 1] = '\0';
++        p[nAvail] = '\0';
 +
 +        return p;
 +}