sctp: hold endpoint before calling cb in sctp_transport_lookup_process

sctp: hold endpoint before calling cb in sctp_transport_lookup_process

commit f9d31c4cf4c11ff10317f038b9c6f7c3bda6cdd4 upstream.

The same fix in commit 5ec7d18d1813 ("sctp: use call_rcu to free endpoint")
is also needed for dumping one asoc and sock after the lookup.

Fixes: 86fdb3448cc1 ("sctp: ensure ep is not destroyed before doing the dump")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>