Unused struct member.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2958 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_dir_random.c

@@ -56,7 +56,6 @@ struct vdi_random {
 	unsigned		magic;
 #define VDI_RANDOM_MAGIC	0x3771ae23
 	struct director		dir;
-	struct backend		*backend;
 	struct vdi_random_host	*hosts;
 	unsigned		nhosts;
 };