Zero the epoll data.ptr on SES_Delete

As of r4456, the sm-structure isn't zeroed. This confused the epoll-waiter
which relied on ev.data.ptr to be NULL.


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4476 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_session.c

@@ -234,6 +234,15 @@ SES_Delete(struct sess *sp)
 		// sm->magic = SESSMEM_MAGIC;
 		// sm->workspace = workspace;
 
+		/* XXX: cache_waiter_epoll.c evaluates data.ptr. If it's
+		 * XXX: not nulled, things go wrong during load.
+		 * XXX: Should probably find a better method to deal with
+		 * XXX: this scenario...
+		 */
+#if defined(HAVE_EPOLL_CTL)
+		sm->sess.ev.data.ptr = NULL;
+#endif
+
 		Lck_Lock(&ses_mem_mtx);
 		VTAILQ_INSERT_HEAD(&ses_free_mem[1 - ses_qp], sm, list);
 		Lck_Unlock(&ses_mem_mtx);