From: Andrew Hendry <redacted>
Date: Tue, 1 Feb 2011 22:55:13 +1100

There are two callers, when I was crashing it I don't remember it
using the backlog path.
x25_process_rx_frame is called from both x25_backlog_rcv and also
x25_receive_data (via x25_lapb_receive_frame)

But reviewing that second path now it looks like it will also leak, -1
would make it skip the kfree_skb there as well.
So patch looks good to me, when I have some time I'll run it through
the environment I had setup originally to confirm.

Andrew, have you had a chance to do this yet?