ipx: fix ipx_release()

Commit b0d0d915 (remove the BKL) added a regression, because
sock_put() can free memory while we are going to use it later.

Fix is to delay sock_put() _after_ release_sock().
Reported-by: NIngo Molnar <mingo@elte.hu>
Tested-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipx/af_ipx.c

@@ -148,7 +148,6 @@ static void ipx_destroy_socket(struct sock *sk)
 	ipx_remove_socket(sk);
 	skb_queue_purge(&sk->sk_receive_queue);
 	sk_refcnt_debug_dec(sk);
-	sock_put(sk);
 }
 
 /*
@@ -1404,6 +1403,7 @@ static int ipx_release(struct socket *sock)
 	sk_refcnt_debug_release(sk);
 	ipx_destroy_socket(sk);
 	release_sock(sk);
+	sock_put(sk);
 out:
 	return 0;
 }