Merge r5225: Report IP and port as "-" rather than passing NULL pointers

If we fail to enqueue a session because all threadpools are filled
we drop the session before we have rendered the clients address.

Report IP and port as "-" rather than passing NULL pointers, which
is not nice under any, and core dump solaris under some circumstances.

Fixes:  #598



git-svn-id: http://www.varnish-cache.org/svn/branches/2.1@5365 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_session.c

@@ -251,6 +251,7 @@ SES_Delete(struct sess *sp)
 {
 	struct acct *b = &sp->acct_ses;
 	struct sessmem *sm;
+	static char noaddr[] = "-";
 
 	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
 	sm = sp->mem;
@@ -261,6 +262,10 @@ SES_Delete(struct sess *sp)
 	VSL_stats->n_sess--;			/* XXX: locking ? */
 	assert(!isnan(b->first));
 	assert(!isnan(sp->t_end));
+	if (sp->addr == NULL)
+		sp->addr = noaddr;
+	if (sp->port == NULL)
+		sp->port = noaddr;
 	VSL(SLT_StatSess, sp->id, "%s %s %.0f %ju %ju %ju %ju %ju %ju %ju",
 	    sp->addr, sp->port, sp->t_end - b->first,
 	    b->sess, b->req, b->pipe, b->pass,