Fix typo that made worker process panic whenever a request came in without

a Host: header.


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@1930 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_backend_simple.c

@@ -340,7 +340,7 @@ bes_GetHostname(struct backend *b)
 {
 	struct bes *bes;
 
-	CHECK_OBJ_NOTNULL(b, SESS_MAGIC);
+	CHECK_OBJ_NOTNULL(b, BACKEND_MAGIC);
 	CAST_OBJ_NOTNULL(bes, b->priv, BES_MAGIC);
 	return (bes->hostname);
 }