Zero the epoll data.ptr on SES_Delete
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: 7d4b18ab7d176792635d6a7a77dd8cbbea8e8daa@4476 d4fa192b-c00b-0410-8231-f00ffab90ce4

wikimedia/operations-debs-varnish,wikimedia/operations-debs-varnish,CartoDB/Varnish-Cache,ssm/pkg-varnish,ssm/pkg-varnish,wikimedia/operations-debs-varnish,wikimedia/operations-debs-varnish,ssm/pkg-varnish,wikimedia/operations-debs-varnish,CartoDB/Varnish-Cache,ssm/pkg-varnish,ssm/pkg-varnish,CartoDB/Varnish-Cache